1
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Tu JL, Huang B. Direct C(sp 3)-H functionalization with aryl and alkyl radicals as intermolecular hydrogen atom transfer (HAT) agents. Chem Commun (Camb) 2024. [PMID: 39268687 DOI: 10.1039/d4cc03383c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/17/2024]
Abstract
Recent years have witnessed the emergence of direct intermolecular C(sp3)-H bond functionalization using in situ generated aryl/alkyl radicals as a unique class of hydrogen atom transfer (HAT) agents. A variety of precursors have been exploited to produce these radical HAT agents under photocatalytic, electrochemical or thermal conditions. To date, viable aryl radical precursors have included aryl diazonium salts or aryl azosulfones, diaryliodonium salts, O-benzoyl oximes, aryl sulfonium salts, aryl thioesters, and aryl halides; and applicable alkyl radical sources have included tetrahalogenated methanes (e.g., CCl3Br, CBr4 and CF3I), N-hydroxyphthalimide esters, alkyl bromides, and acetic acid. This review summarizes the current advances in direct intermolecular C(sp3)-H functionalization through key HAT events with in situ generated aryl/alkyl radicals and categorizes the procedures by the specific radical precursors applied. With an emphasis on the reaction conditions, mechanisms and representative substrate scopes of these protocols, this review aims to demonstrate the current trends and future challenges of this emerging field.
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Affiliation(s)
- Jia-Lin Tu
- Faculty of Arts and Sciences, Beijing Normal University, Zhuhai 519085, China.
- School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Binbin Huang
- Faculty of Arts and Sciences, Beijing Normal University, Zhuhai 519085, China.
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2
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Kornowicz A, Pietrzak T, Korona K, Terlecki M, Justyniak I, Kubas A, Lewiński J. Fresh Impetus in the Chemistry of Calcium Peroxides. J Am Chem Soc 2024; 146:18938-18947. [PMID: 38847558 PMCID: PMC11258691 DOI: 10.1021/jacs.4c00906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 05/22/2024] [Accepted: 05/22/2024] [Indexed: 07/18/2024]
Abstract
Redox-inactive metal ions are essential in modulating the reactivity of various oxygen-containing metal complexes and metalloenzymes, including photosystem II (PSII). The heart of this unique membrane-protein complex comprises the Mn4CaO5 cluster, in which the Ca2+ ion acts as a critical cofactor in the splitting of water in PSII. However, there is still a lack of studies involving Ca-based reactive oxygen species (ROS) systems, and the exact nature of the interaction between the Ca2+ center and ROS in PSII still generates intense debate. Here, harnessing a novel Ca-TEMPO complex supported by the β-diketiminate ligand to control the activation of O2, we report the isolation and structural characterization of hitherto elusive Ca peroxides, a homometallic Ca hydroperoxide and a heterometallic Ca/K peroxide. Our studies indicate that the presence of K+ cations is a key factor controlling the outcome of the oxygenation reaction of the model Ca-TEMPO complex. Combining experimental observations with computational investigations, we also propose a mechanistic rationalization for the reaction outcomes. The designed approach demonstrates metal-TEMPO complexes as a versatile platform for O2 activation and advances the understanding of Ca/ROS systems.
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Affiliation(s)
- Arkadiusz Kornowicz
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Tomasz Pietrzak
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Krzesimir Korona
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Michał Terlecki
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Iwona Justyniak
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Adam Kubas
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Janusz Lewiński
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
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3
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Meger FS, Murphy JA. Recent Advances in C-H Functionalisation through Indirect Hydrogen Atom Transfer. Molecules 2023; 28:6127. [PMID: 37630379 PMCID: PMC10459052 DOI: 10.3390/molecules28166127] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Revised: 08/09/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023] Open
Abstract
The functionalisation of C-H bonds has been an enormous achievement in synthetic methodology, enabling new retrosynthetic disconnections and affording simple synthetic equivalents for synthons. Hydrogen atom transfer (HAT) is a key method for forming alkyl radicals from C-H substrates. Classic reactions, including the Barton nitrite ester reaction and Hofmann-Löffler-Freytag reaction, among others, provided early examples of HAT. However, recent developments in photoredox catalysis and electrochemistry have made HAT a powerful synthetic tool capable of introducing a wide range of functional groups into C-H bonds. Moreover, greater mechanistic insights into HAT have stimulated the development of increasingly site-selective protocols. Site-selectivity can be achieved through the tuning of electron density at certain C-H bonds using additives, a judicious choice of HAT reagent, and a solvent system. Herein, we describe the latest methods for functionalizing C-H/Si-H/Ge-H bonds using indirect HAT between 2018-2023, as well as a critical discussion of new HAT reagents, mechanistic aspects, substrate scopes, and background contexts of the protocols.
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Affiliation(s)
- Filip S. Meger
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, 16 Avinguda dels Països Catalans, 43007 Tarragona, Catalonia, Spain
| | - John A. Murphy
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK
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4
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Chen YJ, Zheng J, Ma JA, Zhang FG. Radical-initiated diazo-retaining nucleophilic addition reaction of trifluorodiazoethane and diazoacetate with 2H‑azirines. J Fluor Chem 2023. [DOI: 10.1016/j.jfluchem.2023.110129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
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5
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Hernández-Pacheco P, Zelada-Guillén GA, Romero-Ávila M, Cañas-Alonso RC, Flores-Álamo M, Escárcega-Bobadilla MV. Enhanced Host-Guest Association and Fluorescence in Copolymers from Copper Salphen Complexes by Supramolecular Internalization of Anions. Chempluschem 2023; 88:e202200310. [PMID: 36175158 DOI: 10.1002/cplu.202200310] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 09/13/2022] [Indexed: 11/10/2022]
Abstract
We describe the synthesis, crystallographic characterization of a new Cu-Salphen compound and its use as a host Lewis-acid against guest anions in two versions: a) free molecule, b) copolymerized with methyl methacrylate:n-butyl acrylate (1 : 4-wt.) as protective co-monomers. Higher contents in Cu-Salphen yielded larger and more homogeneous polymer sizes. Polymer size together with glass transitions, heat capacity, thermal degradation, guest-saturation degrees and host-guest species distribution profiles from spectrophotometric titrations explained growths of up to 630-fold in K11 and 180000-fold in K12 for the host's binding site attributable to a solvophobic protection from the macromolecular structure. Spectrofluorimetry revealed blue-shifted×13-16 larger luminescence for Cu-Salphen in the polymers (λem =488-498 nm) than that of the non-polymerized counterpart (λem =510-543 nm) and "turn-on" blue-shifted enhanced fluorescence upon guest association. We propose a cooperative incorporation of the guests occurring from the outer medium toward internally protected binding site pockets in the random coil polymer conformations.
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Affiliation(s)
- Paulina Hernández-Pacheco
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Gustavo A Zelada-Guillén
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Margarita Romero-Ávila
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Roberto Carlos Cañas-Alonso
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Marcos Flores-Álamo
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Martha V Escárcega-Bobadilla
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
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6
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Terlecki M, Justyniak I, Leszczyński MK, Bernatowicz P, Lewiński J. Factors controlling the structure of alkylzinc amidinates: on the role of N-substituents. Dalton Trans 2023; 52:2712-2721. [PMID: 36748844 DOI: 10.1039/d2dt03722j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Despite various applications of alkylzinc complexes supported by N,N-bidentate ligands in chemistry and materials science, the corresponding organozinc amidinates still represent an insufficiently explored area. To gain a more in-depth understanding of factors controlling the structure and stability of alkylzinc amidinates, we selected benzamidinate and N,N'-diphenylformamidinate ligands as model N,N'-unsubstituted and N,N'-diaryl substituted ligands, respectively, to systematically modify the secondary coordination sphere of the Zn center. A series of new alkylzinc amidinates has been synthesized and their molecular structures identified in both the solid state (single-crystal X-ray crystallography) and solution (NMR and FTIR spectroscopy). The results indicate that [RZnL]x-type amidinate moieties are essentially unstable and tend to undergo Schlenk equilibria-mediated ligand scrambling leading to more thermodynamically stable non-stoichiometric [R2Zn3L4]- and [R3Zn4L5]-type complexes. This process is significantly influenced by the secondary coordination sphere noncovalent interactions as well as the steric hindrance provided by both zinc-bounded alkyl groups and the N-substituents.
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Affiliation(s)
- Michał Terlecki
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.
| | - Iwona Justyniak
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Michał K Leszczyński
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland. .,Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Piotr Bernatowicz
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Janusz Lewiński
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland. .,Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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7
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Leszczyński M, Kornacki D, Terlecki M, Justyniak I, Miletić GI, Halasz I, Bernatowicz P, Szejko V, Lewiński J. Mechanochemical vs Wet Approach for Directing CO 2 Capture toward Various Carbonate and Bicarbonate Networks. ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2022; 10:4374-4380. [PMID: 35433136 PMCID: PMC9006257 DOI: 10.1021/acssuschemeng.1c08402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 03/24/2022] [Indexed: 06/14/2023]
Abstract
The distinct research areas related to CO2 capture and mechanochemistry are both highly attractive in the context of green chemistry. However, merger of these two areas, i.e., mechanochemical CO2 capture, is still in an early stage of development. Here, the application of biguanidine as an active species for CO2 capture is investigated using both solution-based and liquid-assisted mechanochemical approaches, which lead to a variety of biguanidinium carbonate and bicarbonate hydrogen-bonded networks. We demonstrate that in solution, the formation of the carbonate vs bicarbonate networks can be directed by the organic solvent, while, remarkably, in the liquid-assisted mechanochemical synthesis employing the same solvents as additives, the selectivity in network formation is inversed. In general, our findings support the view of mechanochemistry not only as a sustainable alternative but rather as a complementary strategy to solution-based synthesis.
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Affiliation(s)
- Michał
K. Leszczyński
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Dawid Kornacki
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Michał Terlecki
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Iwona Justyniak
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | | | - Ivan Halasz
- Ruđ̵er
Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Piotr Bernatowicz
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Vadim Szejko
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Janusz Lewiński
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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8
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Tulewicz A, Szejko V, Justyniak I, Wolska M, Lewinski J. Exploring the reactivity of homoleptic organozincs towards SO 2: Synthesis and structure of a homologous series of organozinc sulfinates. Dalton Trans 2022; 51:7241-7247. [DOI: 10.1039/d2dt00577h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Studies on the reactivity of zinc alkyl compounds towards SO2 are relatively less explored than either the oxygenation or hydrolysis reactions. We report on environmentally friendly and efficient syntheses of...
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9
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Gladkov AA, Chernov GN, Levin VV, Kokorekin VA, Dilman AD. Photoredox Activation of Organozinc Reagents: Barbier-Type Reaction of Alkyl Halides with α-(Trifluoromethyl)styrenes. Org Lett 2021; 23:9645-9648. [PMID: 34818011 DOI: 10.1021/acs.orglett.1c03917] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Organozinc reagents may be activated under blue light irradiation using an organic photocatalyst to generate alkyl radicals. The radicals are trapped by α-(trifluoromethyl)styrenes leading to gem-difluorinated products after elimination of fluoride. The reaction can be conveniently performed under Barbier conditions starting from organic iodides and bromides and elemental zinc.
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Affiliation(s)
- Anton A Gladkov
- N. D. Zelinsky Institute of Organic Chemistry, Leninsky prosp. 47, 119991 Moscow, Russian Federation.,Lomonosov Moscow State University, Department of Chemistry, Leninskie Gory 1-3, 119991 Moscow, Russian Federation
| | - Grigory N Chernov
- N. D. Zelinsky Institute of Organic Chemistry, Leninsky prosp. 47, 119991 Moscow, Russian Federation.,Lomonosov Moscow State University, Department of Chemistry, Leninskie Gory 1-3, 119991 Moscow, Russian Federation
| | - Vitalij V Levin
- N. D. Zelinsky Institute of Organic Chemistry, Leninsky prosp. 47, 119991 Moscow, Russian Federation
| | - Vladimir A Kokorekin
- N. D. Zelinsky Institute of Organic Chemistry, Leninsky prosp. 47, 119991 Moscow, Russian Federation
| | - Alexander D Dilman
- N. D. Zelinsky Institute of Organic Chemistry, Leninsky prosp. 47, 119991 Moscow, Russian Federation
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10
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Wang J, Fang WH, Qu LB, Shen L, Maseras F, Chen X. An Expanded SET Model Associated with the Functional Hindrance Dominates the Amide-Directed Distal sp 3 C-H Functionalization. J Am Chem Soc 2021; 143:19406-19416. [PMID: 34761900 DOI: 10.1021/jacs.1c07983] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The mechanistic understanding of catalytic radical reactions currently lags behind the flourishing development of new types of catalytic activation. Herein, an innovative single electron transfer (SET) model has been expanded by using the nonadiabatic crossing integrated with the rate-determining step of 1,5-hydrogen atom transfer (HAT) reaction to provide the control mechanism of radical decay dynamics through calculating excited-state relaxation paths of a paradigm example of the amide-directed distal sp3 C-H bond alkylation mediated by Ir-complex-based photocatalysts. The stability of carbon radical intermediates, the functional hindrance associated with the back SET, and the energy inversion between the reactive triplet and closed-shell ground states were verified to be key factors in improving catalytic efficiency via blocking radical inhibition. The expanded SET model associated with the dynamic behaviors and kinetic data could guide the design and manipulation of visible-light-driven inert bond activation by the utilization of photocatalysts bearing more or less electron-withdrawing groups and the comprehensive considerations of kinetic solvent effects and electron-withdrawing effects of substrates.
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Affiliation(s)
- Juanjuan Wang
- Department of Chemistry, Beijing Normal University, Xin-wai-da-jie No. 19, Beijing 100875, China
| | - Wei-Hai Fang
- Department of Chemistry, Beijing Normal University, Xin-wai-da-jie No. 19, Beijing 100875, China
| | - Ling-Bo Qu
- College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Lin Shen
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Feliu Maseras
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Avgda. Països Catalans, 16, 43007 Tarragona, Spain.,College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Xuebo Chen
- Department of Chemistry, Beijing Normal University, Xin-wai-da-jie No. 19, Beijing 100875, China.,College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
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11
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Budny-Godlewski K, Leszczyński MK, Tulewicz A, Justyniak I, Pinkowicz D, Sieklucka B, Kruczała K, Sojka Z, Lewiński J. A Case Study on the Desired Selectivity in Solid-State Mechano- and Slow-Chemistry, Melt, and Solution Methodologies. CHEMSUSCHEM 2021; 14:3887-3894. [PMID: 34289248 DOI: 10.1002/cssc.202101269] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Indexed: 06/13/2023]
Abstract
Solution-based syntheses are omnipresent in chemistry but are often associated with obvious disadvantages, and the search for new mild and green synthetic methods continues to be a hot topic. Here, comparative studies in four different reaction media were conducted, that is, the solid-state mechano- and slow-chemistry synthesis, melted phase, and solution protocols, and the impact of the employed solvent-free solid-state versus liquid-phase synthetic approaches was highlighted on a pool of products. A moderately exothermic model reaction system was chosen based on bis(pentafluorophenyl)zinc, (C6 F5 )2 Zn, and 2,2,6,6-tetramethylpiperidinyl oxide (TEMPO) as a stable nitroxyl radical, anticipating that these reagents may offer a unique landscape for addressing kinetic and thermodynamic aspects of wet and solvent-free solid-state processes. In a toluene solution two distinct paramagnetic Lewis acid-base adducts (C6 F5 )2 Zn(η1 -TEMPO) (1) and (C6 F5 )2 Zn(η1 -TEMPO)2 (2) equilibrated, but only 2 was affordable by crystallization. In turn, crystallization from the melt was the only method yielding single crystals of 1. Moreover, the solid-state approaches were stoichiometry sensitive and allowed for the selective synthesis of both adducts by simple stoichiometric control over the substrates. Density functional theory (DFT) calculations were carried out to examine selected structural and thermodynamic features of the adducts 1 and 2. Compound 2 is a unique non-redox active metal complex supported by two nitroxide radicals, and the magnetic studies revealed weak-to-moderate intramolecular antiferromagnetic interactions between the two coordinated TEMPO molecules.
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Affiliation(s)
- Krzysztof Budny-Godlewski
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Michał K Leszczyński
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Adam Tulewicz
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Iwona Justyniak
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Dawid Pinkowicz
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Cracow, Poland
| | - Barbara Sieklucka
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Cracow, Poland
| | - Krzysztof Kruczała
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Cracow, Poland
| | - Zbigniew Sojka
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Cracow, Poland
| | - Janusz Lewiński
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
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12
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Towards deeper understanding of multifaceted chemistry of magnesium alkylperoxides. Commun Chem 2021; 4:123. [PMID: 36697811 PMCID: PMC9814855 DOI: 10.1038/s42004-021-00560-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 08/02/2021] [Indexed: 01/28/2023] Open
Abstract
Despite considerable progress in the multifaceted chemistry of non-redox-metal alkylperoxides, the knowledge about magnesium alkylperoxides is in its infancy and only started to gain momentum. Harnessing the well-defined dimeric magnesium tert-butylperoxide [(f5BDI)Mg(μ-η2:η1-OOtBu)]2 incorporating a fluorinated β-diketiminate ligand, herein, we demonstrate its transformation at ambient temperature to a spiro-type, tetranuclear magnesium alkylperoxide [(f5BDI)2Mg4(μ-OOtBu)6]. The latter compound was characterized by single-crystal X-ray diffraction and its molecular structure can formally be considered as a homoleptic magnesium tert-butylperoxide [Mg(µ-OOtBu)2]2 terminated by two monomeric magnesium tert-butylperoxides. The formation of the tetranuclear magnesium alkylperoxide not only contradicts the notion of the high instability of magnesium alkylperoxides, but also highlights that there is much to be clarified with respect to the solution behaviour of these species. Finally, we probed the reactivity of the dimeric alkylperoxide in model oxygen transfer reactions like the commonly invoked metathesis reaction with the parent alkylmagnesium and the catalytic epoxidation of trans-chalcone with tert-butylhydroperoxide as an oxidant. The results showed that the investigated system is among the most active known catalysts for the epoxidation of enones.
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13
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Zelga K, Pietrzak T, Han T, Justyniak I, Chwojnowska E, Sobota P, Lewiński J. Effectiveness of the Oxygenation over Classical Protonolysis Reactions: A Case of Alkylzinc Complexes Incorporating an Aminoalcoholate Ligand. Chemistry 2021; 27:14234-14239. [PMID: 34346529 DOI: 10.1002/chem.202102172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Indexed: 11/06/2022]
Abstract
Alkylzinc aminoalcoholates have emerged as powerful catalysts in organic synthesis and polymerization processes. Despite extensive research, difficulties in the rational design of these catalytic systems and in-depth understanding of their modes of action have hitherto been encountered. Most of the major obstacles stem largely from the relatively limited knowledge of the structure-activity relationship of zinc catalysts. In fact, the key active species are often generated in situ via the protonolysis of the alkylzinc precursors, which precludes their isolation and detailed characterization. Herein, the effectiveness of the oxygenation over the classical protonolysis in the synthesis of zinc alkylperoxides stabilized by an aminoalcoholate ligand is demonstrated. The controlled oxygenation of a tert-butylzinc complex incorporating a pridinolum (prinol) ligand leads to well-defined a dinuclear adduct of a (prinol)ZnOOtBu moiety with the parent tBuZn(prinol) complex and a novel dimer [tBuOOZn(prinol)]2 with terminal alkylperoxide groups. The observed reaction outcomes strongly depend on the reaction conditions. Although sparse examples of heteroleptic adducts of the [RZn(L)]x [ROOZn(L)]y -type are known, the herein reported homoleptic [ROOZn(L)]x aggregate is unprecedented. Strikingly, comparative studies involving reactions between tBuZn(prinol) and tert-butylhydroperoxide or ethanol revealed that the respective seemingly simple zinc alkylperoxides, or zinc alkoxides, respectively, are not accessible via the classical alcoholysis. We believe that these game-changing results concerning multifaceted chemistry of organozinc aminoalcoholates should pave the way for more rational development of various Zn-based catalytic systems.
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Affiliation(s)
- Karolina Zelga
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland
| | - Tomasz Pietrzak
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland
| | - Tomasz Han
- Faculty of Chemistry, University of Wrocław Polish Academy of Science, F. Joliot-Curie '4, 50-383, Wrocław, Poland
| | - Iwona Justyniak
- Institute of Physical Chemistry, Polish Academy of Science, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Elżbieta Chwojnowska
- Institute of Physical Chemistry, Polish Academy of Science, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Piotr Sobota
- Faculty of Chemistry, University of Wrocław Polish Academy of Science, F. Joliot-Curie '4, 50-383, Wrocław, Poland
| | - Janusz Lewiński
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland.,Institute of Physical Chemistry, Polish Academy of Science, Kasprzaka 44/52, 01-224, Warsaw, Poland
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14
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Yamada KI, Fujiwara S, Inokuma T, Sugano M, Yamaoka Y, Takasu K. The rationale for stereoinduction in conjugate addition to alkylidenemalonates bearing a menthol-derived chiral auxiliary. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Mizuta Y, Okada H, Zhao C, Sugimoto R, Nishiwaki N, Kobiro K. Surface functionalization of ethylene–tetrafluoroethylene copolymer film with poly(methyl methacrylate) via chemical radical polymerization. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123826] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Romain E, Vega‐Hernández K, Guégan F, Sanz García J, Fopp C, Chemla F, Ferreira F, Gerard H, Jackowski O, Halbert S, Oestreich M, Perez‐Luna A. Development of a Radical Silylzincation of (Het)Aryl‐Substituted Alkynes and Computational Insights into the Origin of the
trans
‐Stereoselectivity. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001566] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Elise Romain
- Sorbonne Université CNRS Institut Parisien de Chimie Moléculaire, IPCM F-75005 Paris France
| | - Karen Vega‐Hernández
- Sorbonne Université CNRS Institut Parisien de Chimie Moléculaire, IPCM F-75005 Paris France
| | - Frédéric Guégan
- Sorbonne Université CNRS Laboratoire de Chimie Théorique, LCT F-75005 Paris France
| | - Juan Sanz García
- Sorbonne Université CNRS Laboratoire de Chimie Théorique, LCT F-75005 Paris France
| | - Carolin Fopp
- Technische Universität Berlin Institut für Chemie Straße des 17. Juni 115 D-10623 Berlin Germany
| | - Fabrice Chemla
- Sorbonne Université CNRS Institut Parisien de Chimie Moléculaire, IPCM F-75005 Paris France
| | - Franck Ferreira
- Sorbonne Université CNRS Institut Parisien de Chimie Moléculaire, IPCM F-75005 Paris France
| | - Hélène Gerard
- Sorbonne Université CNRS Laboratoire de Chimie Théorique, LCT F-75005 Paris France
| | - Olivier Jackowski
- Sorbonne Université CNRS Institut Parisien de Chimie Moléculaire, IPCM F-75005 Paris France
| | - Stéphanie Halbert
- Sorbonne Université CNRS Laboratoire de Chimie Théorique, LCT F-75005 Paris France
| | - Martin Oestreich
- Technische Universität Berlin Institut für Chemie Straße des 17. Juni 115 D-10623 Berlin Germany
| | - Alejandro Perez‐Luna
- Sorbonne Université CNRS Institut Parisien de Chimie Moléculaire, IPCM F-75005 Paris France
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17
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Zelada-Guillén GA, Hernández-Pacheco P, Romero-Ávila M, Cañas-Alonso RC, Flores-Álamo M, Escárcega-Bobadilla MV. Acrylic Polymers Containing a Nickel Salphen Complex: An Approach to Supramolecular and Macromolecular Systems. Chempluschem 2020; 85:2546-2556. [PMID: 32945594 DOI: 10.1002/cplu.202000471] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 08/21/2020] [Indexed: 11/10/2022]
Abstract
The synthesis, characterization and crystallographic analysis is reported of a new Nickel Salphen complex and its radical copolymerization with n-butyl acrylate and methyl methacrylate to produce novel host macromolecules with tunable association against guest anions. Spectrophotometric titrations of the complex and of the polymers revealed that a supramolecular regulation of guest-binding accessibility was enabled by the number of Ni-Salphen units per chain. The latter content in turn, determined the chain size and molecular weight uniformity upon polymerization, and likely increased the strength in interchain/intrachain non-covalent interactions over the nickel center and the acrylic domains. The study also showed that incorporation of the monomer into the acrylic polymer backbone opened the possibility for the nickel binding site to gain access to host:guest stoichiometric discrimination, switching from 1 : 1 (major) and 1 : 2 (minor) both coexisting for the host when in the free form, to mostly 1 : 2 when in the polymerized version.
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Affiliation(s)
- Gustavo A Zelada-Guillén
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Paulina Hernández-Pacheco
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Margarita Romero-Ávila
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Roberto Carlos Cañas-Alonso
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Marcos Flores-Álamo
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Martha V Escárcega-Bobadilla
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
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18
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Rola-Noworyta A, Pietrzak T, Szejko V, Justyniak I, Lewiński J. Unveiling Complexity of the Oxygenation of Aluminum Alkyls by the Isolation of Unique Alkylperoxide and Oxoalkoxide Compounds. Inorg Chem 2020; 59:13807-13811. [PMID: 32806017 PMCID: PMC7539294 DOI: 10.1021/acs.inorgchem.0c01962] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
While aluminum alkyls are often considered
to be exemplary compounds of main-group organometallics and an in-depth
understanding of their multifaceted chemistry is continually vital,
the controlled oxygenation of organoaluminum complexes still remains
a largely undeveloped area. In the course of our systematic studies
on the relationship between the Lewis acidity of metal centers and
noncovalent interactions in the secondary coordination sphere, we
report the oxygenation of dialkylaluminum complexes incorporating
a pyrrole–ester ligand, as purposefully selected dormant Lewis
acidic octet-compliant model compounds, and the isolation and characterization
of a new, dimeric aluminum tert-butylperoxide and
an unique example of an aluminum oxoethoxide cluster. Our studies
provide a more in-depth look at the diversity and complexity of the
oxygenation chemistry of aluminum alkyls. We report the reactions of dialkylaluminum complexes incorporating
a pyrrole−ester ligand with dioxygen as well as the isolation
of a novel aluminum tert-butylperoxide and an unique
example of aluminum oxoethoxide. Our studies provide a more in-depth
look at the diversity and complexity of the oxygenation chemistry
of aluminum alkyls.
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Affiliation(s)
- Anna Rola-Noworyta
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Tomasz Pietrzak
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Vadim Szejko
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Iwona Justyniak
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Janusz Lewiński
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.,Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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19
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Vil' VA, Grishin SS, Baberkina EP, Kostyagina VA, Kovalenko AE, Terent'ev AO. Radical addition of tetrahydrofuran to imines assisted by tert-butyl hydroperoxide. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152150] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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20
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Nawrocki J, Prochowicz D, Justyniak I, van Leusen J, Kornowicz A, Kögerler P, Lewiński J. Synthesis, structure and magnetic properties of a novel high-nuclearity oxo-carboxylate [Zn xCo 13-x(μ 4-O) 4(O 2CPh) 18] cluster. Dalton Trans 2019; 48:12828-12831. [PMID: 31414087 DOI: 10.1039/c9dt02791b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The charge-neutral bimetallic Zn(ii)/Co(ii) tridecanuclear oxocarboxylate cluster [ZnxCo13-x(μ4-O)4(O2CPh)18] (x≈ 5.6) was synthesized under anaerobic conditions by the controlled hydrolysis of an alkylzinc carboxylate [EtZn(O2CPh)] in the presence of cobalt(ii) benzoate Co(O2CPh)2. The composition and molecular structure of the resulting aggregates were solved by a combination of elemental analysis, infrared spectroscopy and single-crystal X-ray diffraction.
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Affiliation(s)
- Jan Nawrocki
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Daniel Prochowicz
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Iwona Justyniak
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Jan van Leusen
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Arkadiusz Kornowicz
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Paul Kögerler
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Janusz Lewiński
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland. and Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
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21
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Budny-Godlewski K, Justyniak I, Leszczyński MK, Lewiński J. Mechanochemical and slow-chemistry radical transformations: a case of diorganozinc compounds and TEMPO. Chem Sci 2019; 10:7149-7155. [PMID: 31588281 PMCID: PMC6686643 DOI: 10.1039/c9sc01396b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 06/16/2019] [Indexed: 12/14/2022] Open
Abstract
From the green chemistry perspective, molecular solid-state transformations conducted under mild conditions are of great interest and desirability. However, research in this area lacked popularity in the previous century, and thus progressed slowly. In particular, the application of radical reactions in solid-state chemistry has been hampered by several long-standing challenges that are intrinsically associated with the apparent unpredictable nature of radical chemistry. We present a comparative study of model mechanochemical, slow-chemistry and solution radical reactions between TEMPO and homoleptic organozinc compounds (i.e., di-tert-butylzinc and diphenylzinc). In the case of the tBu2Zn/TEMPO reaction system only a dimeric diamagnetic complex [tBuZn(μ-TEMPO*)]2 is obtained in yields slightly varying with the method chosen. In contrast, when TEMPO is mixed with diphenylzinc in a 2 : 1 molar ratio a novel paramagnetic Lewis acid-base adduct [[Ph2Zn(η1-TEMPO)]·TEMPO] is isolated in high yields regardless of the applied methodology. This adduct is also formed in the slow-chemistry process when TEMPO is gently mixed with Ph2Zn in a 1 : 1 molar ratio and left for two weeks at ambient temperature. Within the next week the reaction mixture gives in high yield a diamagnetic dinuclear compound [PhZn(μ-TEMPO*)][PhZn(μ2-η1:η1-TEMPO*)] and biphenyl. The analogous reaction conducted in toluene results in a much lower conversion rate. The reported results open up a new horizon in molecular solid-state radical transformations.
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Affiliation(s)
- Krzysztof Budny-Godlewski
- Faculty of Chemistry , Warsaw University of Technology , Noakowskiego 3 , 00-664 Warsaw , Poland . ; ; Tel: +48 22 2347315
| | - Iwona Justyniak
- Institute of Physical Chemistry , Polish Academy of Sciences , Kasprzaka 44/52 , 01-224 Warsaw , Poland
| | - Michał K Leszczyński
- Institute of Physical Chemistry , Polish Academy of Sciences , Kasprzaka 44/52 , 01-224 Warsaw , Poland
| | - Janusz Lewiński
- Faculty of Chemistry , Warsaw University of Technology , Noakowskiego 3 , 00-664 Warsaw , Poland . ; ; Tel: +48 22 2347315
- Institute of Physical Chemistry , Polish Academy of Sciences , Kasprzaka 44/52 , 01-224 Warsaw , Poland
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22
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Pietrzak T, Justyniak I, Kubisiak M, Bojarski E, Lewiński J. An In‐Depth Look at the Reactivity of Non‐Redox‐Metal Alkylperoxides. Angew Chem Int Ed Engl 2019; 58:8526-8530. [DOI: 10.1002/anie.201904380] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Tomasz Pietrzak
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Iwona Justyniak
- Institute of Physical ChemistryPolish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
| | - Marcin Kubisiak
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Emil Bojarski
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Janusz Lewiński
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
- Institute of Physical ChemistryPolish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
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23
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Zelada-Guillén GA, Cuéllar-Sánchez AB, Romero-Ávila M, Escárcega-Bobadilla MV. Synthesis of a Novel Zn-Salphen Building Block and Its Acrylic Terpolymer Counterparts as Tunable Supramolecular Recognition Systems. MOLECULES (BASEL, SWITZERLAND) 2019; 24:molecules24122245. [PMID: 31208097 PMCID: PMC6631749 DOI: 10.3390/molecules24122245] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 05/25/2019] [Accepted: 05/30/2019] [Indexed: 02/06/2023]
Abstract
In this work, we present the synthesis of a novel Zn-Salphen complex containing an allyl group, which was used as building block in the further preparation of a new family of functional terpolymers. These polymers were obtained through radical co-polymerization with methyl metacrylate (MMA) and n-butyl acrylate (nBuA) in different ratios. The supramolecular recognition behavior of each polymer was evaluated via potentiometric measurements against selected anions in aqueous media. Interestingly, this proof of concept study shows that these systems were selective against only fluoride (F−) or both, fluoride and acetate (OAc−), by tailoring the relative content of Zn-Salphen monomer, thus making them a promising starting point for modular design of chemical sensors through straightforward synthetic approaches.
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Affiliation(s)
- Gustavo A Zelada-Guillén
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City 04510, Mexico.
| | - Ana B Cuéllar-Sánchez
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City 04510, Mexico.
| | - Margarita Romero-Ávila
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City 04510, Mexico.
| | - Martha V Escárcega-Bobadilla
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City 04510, Mexico.
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24
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Pietrzak T, Justyniak I, Kubisiak M, Bojarski E, Lewiński J. An In‐Depth Look at the Reactivity of Non‐Redox‐Metal Alkylperoxides. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tomasz Pietrzak
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Iwona Justyniak
- Institute of Physical ChemistryPolish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
| | - Marcin Kubisiak
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Emil Bojarski
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Janusz Lewiński
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
- Institute of Physical ChemistryPolish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
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25
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Han JB, Guo A, Tang XY. Alkylation of Allyl/Alkenyl Sulfones by Deoxygenation of Alkoxyl Radicals. Chemistry 2019; 25:2989-2994. [PMID: 30624002 DOI: 10.1002/chem.201806138] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 01/04/2019] [Indexed: 11/12/2022]
Abstract
A challenging deoxygenation of alkoxyl radicals from readily accessible alcohol derivatives was developed, affording facile synthesis of functionalized alkenes with good functional group tolerance under mild reaction conditions. Because alkoxyl radicals can easily undergo β-fragmentations or hydrogen abstractions, this new strategy for deoxygenation of alkoxyl radicals is highly valuable. Moreover, mechanistic studies revealed that the electron-neutral phosphine acts as the deoxygenation reagent.
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Affiliation(s)
- Jia-Bin Han
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, P. R. China
| | - Ao Guo
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, P. R. China
| | - Xiang-Ying Tang
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, P. R. China
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26
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Pietrzak T, Justyniak I, Park JV, Terlecki M, Kapuśniak Ł, Lewiński J. Reaching Milestones in the Oxygenation Chemistry of Magnesium Alkyls: towards Intimate States of O
2
Activation and the First Monomeric Well‐Defined Magnesium Alkylperoxide. Chemistry 2019; 25:2503-2510. [DOI: 10.1002/chem.201805180] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 12/04/2018] [Indexed: 01/09/2023]
Affiliation(s)
- Tomasz Pietrzak
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Iwona Justyniak
- Institute of Physical ChemistryPolish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
| | - Jiwon Victoria Park
- Department of ChemistryMassachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA
| | - Michał Terlecki
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Łukasz Kapuśniak
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Janusz Lewiński
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
- Institute of Physical ChemistryPolish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
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27
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Székely A, Klussmann M. Molecular Radical Chain Initiators for Ambient‐ to Low‐Temperature Applications. Chem Asian J 2018; 14:105-115. [DOI: 10.1002/asia.201801636] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Indexed: 01/14/2023]
Affiliation(s)
- Anna Székely
- Max Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 2 45470 Mülheim an der Ruhr Germany
| | - Martin Klussmann
- Max Planck Institut für Kohlenforschung Kaiser-Wilhelm-Platz 2 45470 Mülheim an der Ruhr Germany
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28
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de la Vega-Hernández K, Romain E, Coffinet A, Bijouard K, Gontard G, Chemla F, Ferreira F, Jackowski O, Perez-Luna A. Radical Germylzincation of α-Heteroatom-Substituted Alkynes. J Am Chem Soc 2018; 140:17632-17642. [DOI: 10.1021/jacs.8b09851] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Elise Romain
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Anais Coffinet
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Kajetan Bijouard
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Geoffrey Gontard
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Fabrice Chemla
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Franck Ferreira
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Olivier Jackowski
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Alejandro Perez-Luna
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
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29
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Folkertsma E, Benthem SH, Jastrzebski JTBH, Lutz M, Moret M, Klein Gebbink RJM. 1,2-Addition of Diethylzinc to a Bis(Imidazolyl)ketone Ligand. Eur J Inorg Chem 2018; 2018:1167-1175. [PMID: 29937689 PMCID: PMC5993287 DOI: 10.1002/ejic.201701363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Indexed: 11/10/2022]
Abstract
In this study, the selective 1,2-addition of diethylzinc to the ketone functionality of BMdiPhIK [bis(1-methyl-4,5-diphenylimidazolyl)ketone] is shown. The reaction product is isolated in a dimeric form with a planar Zn2(µ-O)2-motif keeping the two monomers together. This compound can serve as a model for reactive intermediates in the catalytic alkylation of ketones with diorganozinc reagents. Hydrolysis of this binuclear zinc compound leads to isolation of the C-alkylated product in 89 % yield. A reaction pathway is proposed in which BMdiPhIK initially coordinates to diethylzinc as a bidentate bis(nitrogen) ligand. This is followed by the homolytic cleavage of the Zn-Et bond and in-cage recombination of the Et-radical and the Zn-coordinated ligand-centered radical, which is mainly localized on the carbonyl moiety of the ligand.
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Affiliation(s)
- Emma Folkertsma
- Organic Chemistry & CatalysisDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584 CGUtrechtThe Netherlands
| | - Sanne H. Benthem
- Organic Chemistry & CatalysisDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584 CGUtrechtThe Netherlands
| | - Johann T. B. H. Jastrzebski
- Organic Chemistry & CatalysisDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584 CGUtrechtThe Netherlands
| | - Martin Lutz
- Crystal and Structural ChemistryBijvoet Center for Biomolecular ResearchUtrecht UniversityPadualaan 83584 CHUtrechtThe Netherlands
| | - Marc‐Etienne Moret
- Organic Chemistry & CatalysisDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584 CGUtrechtThe Netherlands
| | - Robertus J. M. Klein Gebbink
- Organic Chemistry & CatalysisDebye Institute for Nanomaterials ScienceUtrecht UniversityUniversiteitsweg 993584 CGUtrechtThe Netherlands
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30
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Di( tert -butyl)aluminum, -gallium and -indium β-diketonates and β-diketiminates, reactions with oxygen and formation of an unprecedented peroxo-rich hexaperoxotriindium compound. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.12.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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31
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Zhang SQ, Chino M, Liu L, Tang Y, Hu X, DeGrado WF, Lombardi A. De Novo Design of Tetranuclear Transition Metal Clusters Stabilized by Hydrogen-Bonded Networks in Helical Bundles. J Am Chem Soc 2018; 140:1294-1304. [PMID: 29249157 PMCID: PMC5860638 DOI: 10.1021/jacs.7b08261] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
De novo design provides an attractive approach to test the mechanism by which metalloproteins define the geometry and reactivity of their metal ion cofactors. While there has been considerable progress in designing proteins that bind transition metal ions including iron-sulfur clusters, the design of tetranuclear clusters with oxygen-rich environments has not been accomplished. Here, we describe the design of tetranuclear clusters, consisting of four Zn2+ and four carboxylate oxygens situated at the vertices of a distorted cube-like structure. The tetra-Zn2+ clusters are bound at a buried site within a four-helix bundle, with each helix donating a single carboxylate (Glu or Asp) and imidazole (His) ligand, as well as second- and third-shell ligands. Overall, the designed site consists of four Zn2+ and 16 polar side chains in a fully connected hydrogen-bonded network. The designed proteins have apolar cores at the top and bottom of the bundle, which drive the assembly of the liganding residues near the center of the bundle. The steric bulk of the apolar residues surrounding the binding site was varied to determine how subtle changes in helix-helix packing affect the binding site. The crystal structures of two of four proteins synthesized were in good agreement with the overall design; both formed a distorted cuboidal site stabilized by flanking second- and third-shell interactions that stabilize the primary ligands. A third structure bound a single Zn2+ in an unanticipated geometry, and the fourth bound multiple Zn2+ at multiple sites at partial occupancy. The metal-binding and conformational properties of the helical bundles in solution, probed by circular dichroism spectroscopy, analytical ultracentrifugation, and NMR, were consistent with the crystal structures.
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Affiliation(s)
- Shao-Qing Zhang
- Department of Chemistry, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104-6396, United States
- Department of Pharmaceutical Chemistry and the Cardiovascular Research Institute, University of California at San Francisco, San Francisco, CA 94158-9001, United States
| | - Marco Chino
- Department of Chemical Sciences, University of Napoli “Federico II”, Via Cintia, 46, I-80126 Napoli, Italy
| | - Lijun Liu
- Department of Pharmaceutical Chemistry and the Cardiovascular Research Institute, University of California at San Francisco, San Francisco, CA 94158-9001, United States
- DLX Scientific, Lawrence, KS 66049, United States
| | - Youzhi Tang
- Department of Pharmaceutical Chemistry and the Cardiovascular Research Institute, University of California at San Francisco, San Francisco, CA 94158-9001, United States
- College of Veterinary Medicine, South China Agricultural University, Guangdong 510642, China
| | - Xiaozhen Hu
- Department of Pharmaceutical Chemistry and the Cardiovascular Research Institute, University of California at San Francisco, San Francisco, CA 94158-9001, United States
| | - William F. DeGrado
- Department of Pharmaceutical Chemistry and the Cardiovascular Research Institute, University of California at San Francisco, San Francisco, CA 94158-9001, United States
| | - Angela Lombardi
- Department of Chemical Sciences, University of Napoli “Federico II”, Via Cintia, 46, I-80126 Napoli, Italy
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32
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Wolska-Pietkiewicz M, Tokarska K, Grala A, Wojewódzka A, Chwojnowska E, Grzonka J, Cywiński PJ, Kruczała K, Sojka Z, Chudy M, Lewiński J. Safe-by-Design Ligand-Coated ZnO Nanocrystals Engineered by an Organometallic Approach: Unique Physicochemical Properties and Low Toxicity toward Lung Cells. Chemistry 2018; 24:4033-4042. [DOI: 10.1002/chem.201704207] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Indexed: 12/25/2022]
Affiliation(s)
| | - Katarzyna Tokarska
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Agnieszka Grala
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Anna Wojewódzka
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Elżbieta Chwojnowska
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Justyna Grzonka
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
- Faculty of Materials Science and Engineering; Warsaw University of Technology; Wołoska 141 02-507 Warsaw Poland
| | - Piotr J. Cywiński
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Krzysztof Kruczała
- Faculty of Chemistry; Jagiellonian University; Gronostajowa 2 30-387 Cracow Poland
| | - Zbigniew Sojka
- Faculty of Chemistry; Jagiellonian University; Gronostajowa 2 30-387 Cracow Poland
| | - Michał Chudy
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Janusz Lewiński
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
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33
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Zeng H, Lu D, Gong Y. Direct Metal-Free C-H Functionalization of Cyclic Ethers with Schiff Bases Through an Azobisisobutyronitrile-Initiated Radical Chain Process. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701288] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Haipeng Zeng
- School of Chemistry and Chemical Engineering; Huazhong University of Science and Technology; 1037 Luoyu Rd. 430074 Wuhan Hubei China
| | - Dengfu Lu
- School of Chemistry and Chemical Engineering; Huazhong University of Science and Technology; 1037 Luoyu Rd. 430074 Wuhan Hubei China
| | - Yuefa Gong
- School of Chemistry and Chemical Engineering; Huazhong University of Science and Technology; 1037 Luoyu Rd. 430074 Wuhan Hubei China
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34
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Wolska-Pietkiewicz M, Grala A, Justyniak I, Hryciuk D, Jędrzejewska M, Grzonka J, Kurzydłowski KJ, Lewiński J. From Well-Defined Alkylzinc Phosphinates to Quantum-Sized ZnO Nanocrystals. Chemistry 2017; 23:11856-11865. [DOI: 10.1002/chem.201701823] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Indexed: 11/11/2022]
Affiliation(s)
| | - Agnieszka Grala
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Iwona Justyniak
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Dymitr Hryciuk
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Maria Jędrzejewska
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Justyna Grzonka
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
- Faculty of Materials Science and Engineering; Warsaw University of Technology; Wołoska 141 02-507 Warsaw Poland
| | - Krzysztof J. Kurzydłowski
- Faculty of Materials Science and Engineering; Warsaw University of Technology; Wołoska 141 02-507 Warsaw Poland
| | - Janusz Lewiński
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
- Institute of Physical Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
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35
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Leszczyński MK, Justyniak I, Lewiński J. Toward Factors Affecting the Degree of Zinc Alkyls Oxygenation: A Case of Organozinc Guanidinate Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00287] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michał K. Leszczyński
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Iwona Justyniak
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Janusz Lewiński
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
- Department
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
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36
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Pietrzak T, Korzyński MD, Justyniak I, Zelga K, Kornowicz A, Ochal Z, Lewiński J. Unprecedented Variety of Outcomes in the Oxygenation of Dinuclear Alkylzinc Derivatives of an N
,N
-Coupled Bis(β-diketimine). Chemistry 2017; 23:7997-8005. [DOI: 10.1002/chem.201700503] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Indexed: 01/08/2023]
Affiliation(s)
- Tomasz Pietrzak
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | | | - Iwona Justyniak
- Institute of Physical Chemistry; Polish Academy of Science; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Karolina Zelga
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Arkadiusz Kornowicz
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Zbigniew Ochal
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Janusz Lewiński
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
- Institute of Physical Chemistry; Polish Academy of Science; Kasprzaka 44/52 01-224 Warsaw Poland
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37
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Bell BM, Clark MB, Devore DD, De Vries TS, Froese RD, Gray KC, Jackson DHK, Kuech TF, Na HY, Kearns KL, Lee KJ, Mukhopadhyay S, Rachford AA, Spencer LP, Woodward WHH. Degradation of Hole Transport Materials via Exciton-Driven Cyclization. ACS APPLIED MATERIALS & INTERFACES 2017; 9:13369-13379. [PMID: 28350953 DOI: 10.1021/acsami.7b00208] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Organic light-emitting diode (OLED) displays have been an active and intense area of research for well over a decade and have now reached commercial success for displays from cell phones to large format televisions. A more thorough understanding of the many different potential degradation modes which cause OLED device failure will be necessary to develop the next generation of OLED materials, improve device lifetime, and to ultimately improve the cost vs performance ratio. Each of the different organic layers in an OLED device can be susceptible to unique decomposition pathways, however stability toward excitons is critical for emissive layer (EML) materials as well as any layer near the recombination zone. This study will specifically focus on degradation modes within the hole transport layer (HTL) with the goal being to identify the general decomposition paths occurring in an operating device and use this information to design new derivatives which can block these pathways. Through post-mortem analyses of several aged OLED devices, an apparently common intramolecular cyclization pathway has been identified that was not previously reported for arylamine-containing HTL materials and that operates parallel to but faster than the previously described fragmentation pathways.
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Affiliation(s)
- Bruce M Bell
- Core Research and Development, The Dow Chemical Company , Midland, Michigan 48674, United States
| | - Michael B Clark
- Core Research and Development, The Dow Chemical Company , Collegeville, Pennsylvania 19426, United States
| | - David D Devore
- Core Research and Development, The Dow Chemical Company , Midland, Michigan 48674, United States
| | - Timothy S De Vries
- Core Research and Development, The Dow Chemical Company , Midland, Michigan 48674, United States
| | - Robert D Froese
- Core Research and Development, The Dow Chemical Company , Midland, Michigan 48674, United States
| | - Kaitlyn C Gray
- Dow AgroSciences , Indianapolis, Indiana 46268, United States
| | - David H K Jackson
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States
| | - T F Kuech
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States
| | - Hong-Yeop Na
- Electronic Materials Research and Development, The Dow Chemical Company , Hwasung 445-170, South Korea
| | - Kenneth L Kearns
- Core Research and Development, The Dow Chemical Company , Midland, Michigan 48674, United States
| | - Kyung-Joo Lee
- Electronic Materials Research and Development, The Dow Chemical Company , Hwasung 445-170, South Korea
| | - Sukrit Mukhopadhyay
- Core Research and Development, The Dow Chemical Company , Midland, Michigan 48674, United States
| | - Aaron A Rachford
- Electronic Materials Research and Development, The Dow Chemical Company , Marlborough, Massachusetts 01752, United States
| | - Liam P Spencer
- Core Research and Development, The Dow Chemical Company , Freeport, Texas 77541, United States
| | - W H Hunter Woodward
- Core Research and Development, The Dow Chemical Company , Midland, Michigan 48674, United States
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38
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Uematsu R, Saka C, Sumiya Y, Ichino T, Taketsugu T, Maeda S. An autocatalytic cycle in autoxidation of triethylborane. Chem Commun (Camb) 2017; 53:7302-7305. [DOI: 10.1039/c7cc02541f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An autocatalytic cycle was found in the mechanism of autoxidation of triethylborane using density functional theory calculations, and studied in detail with kinetic simulations.
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Affiliation(s)
- Ryohei Uematsu
- Graduate School of Chemical Sciences and Engineering
- Hokkaido University
- Kita-ku
- Japan
| | - Chihiro Saka
- Graduate School of Chemical Sciences and Engineering
- Hokkaido University
- Kita-ku
- Japan
| | - Yosuke Sumiya
- Graduate School of Chemical Sciences and Engineering
- Hokkaido University
- Kita-ku
- Japan
| | - Tomoya Ichino
- Department of Chemistry
- Hokkaido University
- Kita-ku
- Japan
| | | | - Satoshi Maeda
- Department of Chemistry
- Hokkaido University
- Kita-ku
- Japan
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39
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Wróbel Z, Pietrzak T, Justyniak I, Lewiński J. Oxygenation of RZn(N,O)-type complexes as an efficient route to zinc alkoxides not accessible via the classical alcoholysis path. Chem Commun (Camb) 2017; 53:10808-10811. [DOI: 10.1039/c7cc05818g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The oxygenation of alkylzincs incorporating a 2-ester substituted pyrrolate ligand (L) leads to zinc alkoxides with an uncommon structural motif in the solid state: a trimer [(L)Zn(μ-OtBu)]3 with the central [Zn3(μ-OR)3] ring or a heterocubane [(L)Zn(μ3-OEt)]4.
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Affiliation(s)
- Zbigniew Wróbel
- Institute of Physical Chemistry
- Polish Academy of Sciences
- Kasprzaka 44/52
- Warsaw 01-224
- Poland
| | - Tomasz Pietrzak
- Department of Chemistry, Warsaw University of Technology, Noakowskiego 3
- Warsaw 00-664
- Poland
| | - Iwona Justyniak
- Institute of Physical Chemistry
- Polish Academy of Sciences
- Kasprzaka 44/52
- Warsaw 01-224
- Poland
| | - Janusz Lewiński
- Institute of Physical Chemistry
- Polish Academy of Sciences
- Kasprzaka 44/52
- Warsaw 01-224
- Poland
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40
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Bortoluzzi M, Bresciani G, Marchetti F, Pampaloni G, Zacchini S. Synthesis and structural characterization of mixed halide–N,N-diethylcarbamates of group 4 metals, including a case of unusual tetrahydrofuran activation. NEW J CHEM 2017. [DOI: 10.1039/c6nj03489f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A straightforward synthesis of dichloride-dicarbamates of group 4 metals consists of the metathesis reaction of the respective tetrahalides with tetracarbamates.
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Affiliation(s)
- Marco Bortoluzzi
- Ca’ Foscari University of Venice
- Dipartimento di Scienze Molecolari e Nanosistemi
- I-30175 Mestre
- Italy
- CIRCC
| | - Giulio Bresciani
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Fabio Marchetti
- CIRCC
- I-70126 Bari
- Italy
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
| | - Guido Pampaloni
- CIRCC
- I-70126 Bari
- Italy
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
| | - Stefano Zacchini
- CIRCC
- I-70126 Bari
- Italy
- University of Bologna
- Dipartimento di Chimica Industriale “Toso Montanari”
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41
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Vishnoi P, Sharma SK, Kaleeswaran D, Murugavel R. Zinc Dialkylhydroxybenzoates with Unusual Structures: First Example of a Discrete Three-Blade Paddle-Wheel and a Solvent Engulfed Coordination Polymer. ChemistrySelect 2016. [DOI: 10.1002/slct.201601853] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Pratap Vishnoi
- Department of Chemistry; Indian Institute of Technology Bombay; Mumbai India 400 076
| | - Sunil K. Sharma
- Department of Chemistry; Indian Institute of Technology Bombay; Mumbai India 400 076
| | - D. Kaleeswaran
- Department of Chemistry; Indian Institute of Technology Bombay; Mumbai India 400 076
| | - Ramaswamy Murugavel
- Department of Chemistry; Indian Institute of Technology Bombay; Mumbai India 400 076
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42
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Pietrzak T, Kubisiak M, Justyniak I, Zelga K, Bojarski E, Tratkiewicz E, Ochal Z, Lewiński J. Oxygenation Chemistry of Magnesium Alkyls Incorporating β-Diketiminate Ligands Revisited. Chemistry 2016; 22:17776-17783. [DOI: 10.1002/chem.201603931] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Tomasz Pietrzak
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Marcin Kubisiak
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Iwona Justyniak
- Institute of Physical Chemistry; Polish Academy of Science; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Karolina Zelga
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Emil Bojarski
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Ewa Tratkiewicz
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Zbigniew Ochal
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Janusz Lewiński
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
- Institute of Physical Chemistry; Polish Academy of Science; Kasprzaka 44/52 01-224 Warsaw Poland
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43
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De Munck L, Vila C, Muñoz MC, Pedro JR. Catalytic Enantioselective Aza-Reformatsky Reaction with Cyclic Imines. Chemistry 2016; 22:17590-17594. [DOI: 10.1002/chem.201604606] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Lode De Munck
- Departament de Química Orgànica; Facultat de Química; Universitat de València; Dr. Moliner 50 46100 Burjassot, València Spain
| | - Carlos Vila
- Departament de Química Orgànica; Facultat de Química; Universitat de València; Dr. Moliner 50 46100 Burjassot, València Spain
| | - M. Carmen Muñoz
- Departament de Física Aplicada; Universitat Politècnica de València; Camino de Vera s/n 46022 València Spain
| | - José R. Pedro
- Departament de Química Orgànica; Facultat de Química; Universitat de València; Dr. Moliner 50 46100 Burjassot, València Spain
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44
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Kulkarni NV, Das A, Ridlen SG, Maxfield E, Adiraju VAK, Yousufuddin M, Dias HVR. Fluorinated triazapentadienyl ligand supported ethyl zinc(ii) complexes: reaction with dioxygen and catalytic applications in the Tishchenko reaction. Dalton Trans 2016; 45:4896-906. [PMID: 26875862 DOI: 10.1039/c6dt00257a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ethyl zinc complexes [N{(C3F7)C(Dipp)N}2]ZnEt, [N{(C3F7)C(Cy)N}2]ZnEt, [N{(CF3)C(2,4,6-Br3C6H2)N}2]ZnEt and [N{(C3F7)C(2,6-Cl2C6H3)N}2]ZnEt have been synthesized from the corresponding 1,3,5-triazapentadiene and diethyl zinc. X-ray data show that [N{(C3F7)C(Dipp)N}2]ZnEt has a distorted trigonal planar geometry at the zinc center. The triazapentadienyl ligand binds to zinc in a κ(2)-mode. The zinc-ethyl bonds of [N{(C3F7)C(Dipp)N}2]ZnEt, [N{(C3F7)C(Cy)N}2]ZnEt, [N{(CF3)C(2,4,6-Br3C6H2)N}2]ZnEt and [N{(C3F7)C(2,6-Cl2C6H3)N}2]ZnEt readily undergo oxygen insertion upon exposure to dry air to produce the corresponding zinc-ethoxy or zinc-ethylperoxy compounds. The ethoxy zinc adducts {[N{(CF3)C(2,4,6-Br3C6H2)N}2]ZnOEt}2 and {[N{(C3F7)C(2,6-Cl2C6H3)N}2]ZnOEt}2 as well as the ethylperoxy zinc adduct {[N{(C3F7)C(Cy)N}2]ZnOOEt}2 have been isolated and fully characterized by several methods including X-ray crystallography. They feature dinuclear structures with four-coordinate zinc sites and bridging-ethoxy or -ethylperoxy groups. The ethyl zinc complexes catalyze the Tishchenko reaction of benzaldehyde under solventless conditions affording benzyl benzoate. The reaction of ethyl zinc complexes with dioxygen and their catalytic behaviour in the Tishchenko reaction are affected by the electronic and steric factors of the triazapentadienyl ligand. {[N{(C3F7)C(Cy)N}2]ZnOOEt}2 is an excellent reagent for the epoxidation of trans-chalcone.
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Affiliation(s)
- Naveen V Kulkarni
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, USA.
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45
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Theoretical investigation of the reaction of dialkylzincs with α-alkoxycarbonyl radicals. Evaluation of α-bromoacrylates as radical acceptors in radical-polar crossover processes. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.09.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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46
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Grala A, Wolska-Pietkiewicz M, Wojewódzka A, Dabergut M, Justyniak I, Lewiński J. Structural Diversity of Ethylzinc Carboxylates. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00557] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Agnieszka Grala
- Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland
| | | | - Anna Wojewódzka
- Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Monika Dabergut
- Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Iwona Justyniak
- Polish Academy of Sciences, Institute of Physical
Chemistry, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Janusz Lewiński
- Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland
- Polish Academy of Sciences, Institute of Physical
Chemistry, Kasprzaka 44/52, 01-224 Warsaw, Poland
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47
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Sølvhøj A, Ahlburg A, Madsen R. Dimethylzinc-Initiated Radical Coupling of β-Bromostyrenes with Ethers and Amines. Chemistry 2015; 21:16272-9. [PMID: 26377614 DOI: 10.1002/chem.201502429] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Indexed: 11/07/2022]
Abstract
A new coupling reaction has been developed in which β-bromostyrenes react with ethers and tertiary amines to introduce the styryl group in the α-position. The transformation is mediated by Me2 Zn/O2 with 10 % MnCl2 and is believed to proceed by a radical addition-elimination mechanism. The ether and the amine are employed as solvent and the coupling takes place through the most stable α radical for unsymmetrical substrates. The products are obtained in moderate to good yields as the pure E isomers. The coupling can be achieved with a range of smaller cyclic and acyclic ethers/amines as well as various substituted β-bromostyrenes.
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Affiliation(s)
- Amanda Sølvhøj
- Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby (Denmark)
| | - Andreas Ahlburg
- Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby (Denmark)
| | - Robert Madsen
- Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby (Denmark).
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Affiliation(s)
- Ken-ichi Yamada
- Graduate School of Pharmaceutical Sciences; Kyoto University; Kyoto Japan
| | - Kiyoshi Tomioka
- Department of Medicinal Chemistry; Faculty of Pharmaceutical Sciences; Doshisha Women's College of Liberal Arts; Kyoto Japan
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