1
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Clapson ML, Dilinaer AD, Lanaque TCQ, Zurakowski JA, Austen BJH, Drover MW. Ynone Co-Coordination at a Nickel Borane Complex: An Assessment of Secondary Coordination Sphere Effects. Inorg Chem 2024; 63:6184-6191. [PMID: 38546051 DOI: 10.1021/acs.inorgchem.3c04264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Secondary coordination sphere ligand effects can be used to direct or organize small molecule substrates at a metal center. Herein, we assess the bifunctional ambiphilic diphosphine, tri-tert-butylboranyldiphosphinoethane (ttbbpe) and its ability to influence stereoselective substrate coordination, while appended to nickel. This report takes a synthetic/computational approach to test the impacts and limitations associated with ligand-directed substrate coordination using [Ni(ttbbpe)(η2:η2-COD)] (COD = 1,5-cyclooctadiene) and ynones (alkynes having an α-carbonyl group at the propargylic position) as model substrates.
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Affiliation(s)
- Marissa L Clapson
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
| | - A Dina Dilinaer
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario N8K 3G6, Canada
| | - Trisha C Q Lanaque
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
| | - Joseph A Zurakowski
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario N8K 3G6, Canada
| | - Brady J H Austen
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario N8K 3G6, Canada
| | - Marcus W Drover
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario N8K 3G6, Canada
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2
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Hidalgo N, Le Gac A, Mallet-Ladeira S, Bouhadir G, Bourissou D. Chemo-selective Stille-type coupling of acyl-chlorides upon phosphine-borane Au(i) catalysis. Chem Sci 2024; 15:5187-5191. [PMID: 38577365 PMCID: PMC10988615 DOI: 10.1039/d3sc06193k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 02/26/2024] [Indexed: 04/06/2024] Open
Abstract
Phosphine-boranes do not promote oxidative addition of acyl chlorides to gold, but the phosphine-borane gold triflimide complex [iPr2P(o-C6H4)BCy2]AuNTf2 was found to catalyze the coupling of acyl chlorides and aryl stannanes. The reaction involves aryl/chloride-bridged dinuclear gold(i) complexes as key intermediates, as substantiated by spectroscopic and crystallographic analyses. Similar to Pd(0)/Pd(ii)-catalyzed Stille coupling with phosphine-borane ligands, the gold-catalyzed variant shows complete chemoselectivity for acyl chlorides over aryl iodides and bromides, enabling straightforward access to halogenated aryl ketones.
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Affiliation(s)
- Nereida Hidalgo
- CNRS/Université Paul Sabatier, Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA UMR 5069) 118 Route de Narbonne 31062 Toulouse Cedex 09 France
- Departamento de Química Inorgánica, Universidad de Sevilla 41071 Sevilla Spain
| | - Arnaud Le Gac
- CNRS/Université Paul Sabatier, Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA UMR 5069) 118 Route de Narbonne 31062 Toulouse Cedex 09 France
| | - Sonia Mallet-Ladeira
- Institut de Chimie de Toulouse (FR 2599) 118 Route de Narbonne 31062 Toulouse Cedex 09 France
| | - Ghenwa Bouhadir
- CNRS/Université Paul Sabatier, Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA UMR 5069) 118 Route de Narbonne 31062 Toulouse Cedex 09 France
| | - Didier Bourissou
- CNRS/Université Paul Sabatier, Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA UMR 5069) 118 Route de Narbonne 31062 Toulouse Cedex 09 France
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3
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Durfy CS, Zurakowski JA, Drover MW. A Blueprint for Secondary Coordination Sphere Editing: Approaches Toward Lewis-Acid Assisted Carbon Dioxide Co-Activation. CHEMSUSCHEM 2024:e202400039. [PMID: 38358843 DOI: 10.1002/cssc.202400039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 02/14/2024] [Accepted: 02/15/2024] [Indexed: 02/17/2024]
Abstract
Carbon dioxide (CO2 ) is a potent greenhouse gas of environmental concern. Seeking to offer a solution to the "CO2 -problem", the chemistry community has turned a focus toward transition metal complexes which can activate, reduce, and convert CO2 into carbon-based products. The design of such systems involves judicious selection of both metal and accompanying donor ligand; in part, these efforts are motivated by biological metalloenzymes that undertake similar transformations. As a design element, metal-ligand cooperativity, which leverages intramolecular interactions between a transition metal and an adjacent secondary ligand site, has been acknowledged as a vitally important component by the CO2 activation community. These systems offer a "push-pull" style of activation where electron density is chaperoned onto CO2 with an accompanying electrophile, such as a Lewis-acid, playing the role of acceptor. This pairing allows for the stabilization of reactive Cx Hy Oz -containing intermediates and can bias CO2 product selectivity. In the laboratory, chemists can test hypotheses and ideas, enabling rationalization of why a given pairing of transition metal/Lewis-acid leads to selective CO2 reduction outcomes. This Concept identifies literature examples and highlights key design properties, allowing interested contributors to design, create, and implement novel systems for productive transformations of a small molecule (CO2 ) with huge potential impact.
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Affiliation(s)
- Connor S Durfy
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario, Canada, N6A 3K7
| | - Joseph A Zurakowski
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario, Canada, N6A 3K7
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario, Canada, N9B 3P4
| | - Marcus W Drover
- Department of Chemistry, Western University, 1151 Richmond Street, London, Ontario, Canada, N6A 3K7
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4
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Durfy CS, Zurakowski JA, Jobin G, Drover MW. An Investigation of Allyl-Substituted Bis(Diphosphine) Iron Complexes: Towards Precursors for Cooperative CO 2 Activation. Chemistry 2024; 30:e202302721. [PMID: 37724786 DOI: 10.1002/chem.202302721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 09/18/2023] [Accepted: 09/19/2023] [Indexed: 09/21/2023]
Abstract
In developing homogenous catalysts capable of CO2 activation, interaction with a metal center is often imperative. This work provides primary efforts towards the cooperative activation of CO2 using a Lewis acidic secondary coordination sphere (SCS) and iron via a paired theoretical/experimental approach. Specifically, this study reports efforts towards [Fe(diphosphine)2 (N2 )] as a CO2 -coordinated synthon where diphosphine=1,2-bis(di(3-cyclohexylboranyl)propylphosphino)ethane) (P2 BCy 4 ) or its precursor, 1,2-bis(diallylphosphino)ethane (tape). Initial efforts toward the {Fe(0)-N2 } complex were focused on deprotonation reactions of [Fe(diphosphine)2 (H)(NCCH3 )]+ and reduction of [Fe(tape)2 Cl2 ]. In the latter case, a mixture of intramolecularly π-bonded alkene and associated metallacyclic Fe(II)-H species were produced - heating this mixture provided the hydride as the major product. Notably, the interconversion of this pair counters that of related intermolecular reactions between [Fe(depe)2 ] (depe=1,2-bis(diethylphosphino)ethane) and ethylene, where hydride formation occurs subsequent to π-coordination; this has been probed by theoretical calculations. Finally, reactivity of the metallacyclic {Fe(II)-H} complex with CO2 was probed, resulting in a pair of isomeric ferra(II)lactones.
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Affiliation(s)
- Connor S Durfy
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
- Department of Chemistry, Western University, 1151 Richmond Street, London, ON, N6A 3K7, Canada
| | - Joseph A Zurakowski
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
- Department of Chemistry, Western University, 1151 Richmond Street, London, ON, N6A 3K7, Canada
| | - Gabriel Jobin
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
- Department of Chemistry, Western University, 1151 Richmond Street, London, ON, N6A 3K7, Canada
| | - Marcus W Drover
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
- Department of Chemistry, Western University, 1151 Richmond Street, London, ON, N6A 3K7, Canada
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5
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Zurakowski JA, Drover MW. Cooperative bond activations by a tucked-in iron complex. Chem Commun (Camb) 2023; 59:11349-11352. [PMID: 37656426 DOI: 10.1039/d3cc03325b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Herein, we report the first example of a 'tucked-in' iron diphosphine complex, formed through deprotonation of a Cp*-(CH̲3) (Cp* = C5Me5-) group by n-butyllithium. The reactivity of this complex was demonstrated by activation of organic and metal-containing substates, including CO2, benzaldehyde, Br-AuI-PPh3, B(C6F5)3, and HBCy2 (Cy = cyclohexyl).
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Affiliation(s)
- Joseph A Zurakowski
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, ON, N9B 3P4, Canada.
| | - Marcus W Drover
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, ON, N9B 3P4, Canada.
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6
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Clapson M, Nelson DJ, Drover MW. Nickel Complexes of Allyl and Vinyldiphenylphosphine. ACS ORGANIC & INORGANIC AU 2023; 3:217-222. [PMID: 37545661 PMCID: PMC10401672 DOI: 10.1021/acsorginorgau.3c00010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 04/25/2023] [Accepted: 04/26/2023] [Indexed: 08/08/2023]
Abstract
Monodentate phosphine-ligated nickel compounds, e.g., [Ni(PPh3)4] are relevant as active catalysts across a broad range of reactions. This report expands upon the coordination chemistry of this family, offering the reactivity of allyl- and vinyl-substituted diphenylphosphine (PPh2R) with [Ni(COD)2] (COD = 1,5-cyclooctadiene). These reactions provide three-coordinate dinickelacycles that are intermolecularly tethered through adjacent {Ni}-olefin interactions. The ring conformation of such cycles has been studied in the solid-state and using theoretical calculations. Here, a difference in reaction outcome is linked to the presence of an allyl vs vinyl group, where the former is observed to undergo rearrangement, bringing about challenges in clean product isolation.
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Affiliation(s)
- Marissa
L. Clapson
- Department
of Chemistry and Biochemistry, The University
of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada
| | - David J. Nelson
- WestCHEM
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland,
U.K.
| | - Marcus W. Drover
- Department
of Chemistry and Biochemistry, The University
of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada
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7
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Austen BJH, Clapson ML, Drover MW. Reactions of nickel boranyl compounds with pnictogen-carbon triple bonds. RSC Adv 2023; 13:19158-19163. [PMID: 37362339 PMCID: PMC10288830 DOI: 10.1039/d3ra02797j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 06/14/2023] [Indexed: 06/28/2023] Open
Abstract
The catalytic conversion of unsaturated small molecules such as nitriles into reduced products is of interest for the production of fine chemicals. In this vein, metal-ligand cooperativity has been leveraged to promote such reactivity, often conferring stability to bound substrate - a balancing act that may offer activation at the cost of turnover efficiency. This report describes the reactivity of a [(diphosphine)Ni] compound with pnictogen carbon triple bonds (R-C[triple bond, length as m-dash]E; E = N, P), where the diphosphine contains two pendant borane groups. For E = N, cooperative nitrile coordination is observed to afford {Ni}2 complexes displaying B-N interactions, whereas for E = P, B-P interactions are absent. This work additionally outlines a structure-activity relationship that uses nitrile dihydroboration as a model reaction to unveil the effect of SCS stabilization, employing [(diphosphine)Ni] where the diphosphine contains 0, 1, or 2 pendant Lewis acid groups.
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Affiliation(s)
- Brady J H Austen
- Department of Chemistry and Biochemistry, The University of Windsor 401 Sunset Avenue Windsor ON N9B 3P4 Canada
| | - Marissa L Clapson
- Department of Chemistry and Biochemistry, The University of Windsor 401 Sunset Avenue Windsor ON N9B 3P4 Canada
| | - Marcus W Drover
- Department of Chemistry and Biochemistry, The University of Windsor 401 Sunset Avenue Windsor ON N9B 3P4 Canada
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8
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Theulier CA, García-Rodeja Y, Miqueu K, Bouhadir G, Bourissou D. Lewis Acid-Assisted C(sp 3)-C(sp 3) Reductive Elimination at Gold. J Am Chem Soc 2023; 145:10800-10808. [PMID: 37137163 DOI: 10.1021/jacs.3c01974] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The phosphine-borane iPr2P(o-C6H4)BFxyl2 (Fxyl = 3,5-(F3C)2C6H3) 1-Fxyl was found to promote the reductive elimination of ethane from [AuMe2(μ-Cl)]2. Nuclear magnetic resonance monitoring revealed the intermediate formation of the (1-Fxyl)AuMe2Cl complex. Density functional theory calculations identified a zwitterionic path as the lowest energy profile, with an overall activation barrier more than 10 kcal/mol lower than without borane assistance. The Lewis acid moiety first abstracts the chloride to generate a zwitterionic Au(III) complex, which then readily undergoes C(sp3)-C(sp3) coupling. The chloride is finally transferred back from boron to gold. The electronic features of this Lewis-assisted reductive elimination at gold have been deciphered by intrinsic bond orbital analyses. Sufficient Lewis acidity of boron is required for the ambiphilic ligand to trigger the C(sp3)-C(sp3) coupling, as shown by complementary studies with two other phosphine-boranes, and the addition of chlorides slows down the reductive elimination of ethane.
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Affiliation(s)
- Cyril A Theulier
- CNRS/Université Paul Sabatier, Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA, UMR 5069), 118 Route de Narbonne, 31062 Cedex 09 Toulouse, France
| | - Yago García-Rodeja
- CNRS/Université de Pau et des Pays de l'Adour, E2S UPPA, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux (IPREM, UMR 5254), Hélioparc, 2 Avenue du Président Angot, 64053 Cedex 09 Pau, France
| | - Karinne Miqueu
- CNRS/Université de Pau et des Pays de l'Adour, E2S UPPA, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux (IPREM, UMR 5254), Hélioparc, 2 Avenue du Président Angot, 64053 Cedex 09 Pau, France
| | - Ghenwa Bouhadir
- CNRS/Université Paul Sabatier, Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA, UMR 5069), 118 Route de Narbonne, 31062 Cedex 09 Toulouse, France
| | - Didier Bourissou
- CNRS/Université Paul Sabatier, Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA, UMR 5069), 118 Route de Narbonne, 31062 Cedex 09 Toulouse, France
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9
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Zurakowski JA, Brown KR, Drover MW. Secondary Coordination Sphere Alkylation Promotes Cyclometalation. Inorg Chem 2023; 62:7053-7060. [PMID: 37120856 DOI: 10.1021/acs.inorgchem.3c00427] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Diphosphines have taken on a dominant role as supporting ligands in transition-metal chemistry. Here, we describe complexes of the type [Cp*Fe(diphosphine)(X)] (X = Cl, H) where for diphosphine = 1,2-bis(di-allylphosphino)ethane (tape), a Lewis-acidic secondary coordination sphere (SCS) was installed via allyl group hydroboration using dicyclohexylborane (HBCy2). The resulting chloride complex, [Cp*Fe(P2BCy4)(Cl)] (P2BCy4 = 1,2-bis(di(3-cyclohexylboranyl)propylphosphino)ethane), was treated with n-butyllithium (1-10 equiv), resulting incyclometalation at iron. This reactivity is contrasted with [Cp*Fe(dnppe)(Cl)] (dnppe = 1,2-bis(di-n-propylphosphino)ethane), whereby addition of n-butyllithium provides a mixture of products. Overall, cyclometalation is a common elementary transformation in organometallic chemistry; here we describe how this outcome is accessed in response to Lewis acid SCS incorporation.
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Affiliation(s)
- Joseph A Zurakowski
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
| | - Kasey R Brown
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
| | - Marcus W Drover
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
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10
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Clapson ML, Sharma H, Zurakowski JA, Drover MW. Cooperative Nitrile Coordination Using Nickel and a Boron-Containing Secondary Coordination Sphere. Chemistry 2023; 29:e202203763. [PMID: 36534339 DOI: 10.1002/chem.202203763] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 12/19/2022] [Accepted: 12/19/2022] [Indexed: 12/23/2022]
Abstract
Metal-ligand cooperation has emerged as a versatile tool for substrate activation in chemical reactivity. Herein, we provide the synthesis and characterization of a monoboranyl-containing analogue of the ubiquitous bulky diphosphine ligand, 1,2-bis(di-tert-butylphosphino)ethane, whose reactivity has been examined using nickel. Together, the pairing of nickel and boron provides a platform that allows for the cooperative coordination of organonitriles, giving unusual examples of intermolecularly bound dinickelacycles.
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Affiliation(s)
- Marissa L Clapson
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
| | - Harvey Sharma
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
| | - Joseph A Zurakowski
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
| | - Marcus W Drover
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
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11
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Skaria M, Culpepper JD, Daly SR. Leveraging Metal and Ligand Reactive Sites for One Pot Reactions: Ligand-Centered Borenium Ions for Tandem Catalysis with Palladium. Chemistry 2022; 28:e202201791. [PMID: 35997655 PMCID: PMC9828003 DOI: 10.1002/chem.202201791] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Indexed: 01/12/2023]
Abstract
Tandem catalysts that perform two different organic transformations in a single pot are highly desirable because they enable rapid and efficient assembly of simple organic building blocks into more complex molecules. Many examples of tandem catalysis rely on metal-catalyzed reactions involving one or more metal complexes. Remarkably, despite surging interest in the development of chemically reactive (i. e., non-innocent) ligands, there are few examples of metal complexes that leverage ligand-centered reactivity to perform catalytic reactions in tandem with separate catalytic reactions at the metal. Here we report how multifunctional Pd complexes with triaminoborane-derived diphosphorus ligands, called TBDPhos, appear to facilitate borenium-catalyzed cycloaddition reactions at the ligand, and Pd-catalyzed Stille and Suzuki cross-coupling reactions at the metal. Both transformations can be accessed in one pot to afford rare examples of tandem catalysis using separate metal and ligand catalysis sites in a single complex.
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Affiliation(s)
- Manisha Skaria
- Department of ChemistryThe University of IowaIowa CityIowa52242USA
| | | | - Scott R. Daly
- Department of ChemistryThe University of IowaIowa CityIowa52242USA
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12
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Austen BJH, Sharma H, Zurakowski JA, Drover MW. Racemic and Meso Diastereomers of a P-Chirogenic Diboranyldiphosphinoethane. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00336] [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]
Affiliation(s)
- Brady J. H. Austen
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada
| | - Harvey Sharma
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada
| | - Joseph A. Zurakowski
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada
| | - Marcus W. Drover
- Department of Chemistry and Biochemistry, The University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4, Canada
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13
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Wang B, Seo CSG, Zhang C, Chu J, Szymczak NK. A Borane Lewis Acid in the Secondary Coordination Sphere of a Ni(II) Imido Imparts Distinct C-H Activation Selectivity. J Am Chem Soc 2022; 144:15793-15802. [PMID: 35973127 PMCID: PMC10276360 DOI: 10.1021/jacs.2c06662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Two borane-functionalized bidentate phosphine ligands that vary in tether length have been prepared to examine cooperative metal-substrate interactions. Ni(0) complexes react with aryl azides at low temperatures to form structurally unusual κ2-(N,N)-N3Ar adducts. Warming these adducts affords products of N2 extrusion and in one case, a Ni-imido compound that is capped by the appended borane. Reactions with 1-azidoadamantane (AdN3) provide a distinct outcome, where a proposed nickel imido intermediate activates the sp2 C-H bonds of arenes, even in the presence of benzylic C-H sites. Combined experimental and computational mechanistic studies demonstrate that the unique reactivity is a consequence of Lewis-acid-induced polarization of the Ni-NR bond, potentially providing a synthetic strategy for chemoselective reaction engineering.
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Affiliation(s)
- Baolu Wang
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 10049, P. R. China
| | - Chris S. G. Seo
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Cuijuan Zhang
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 10049, P. R. China
| | - Jiaxiang Chu
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 10049, P. R. China
| | - Nathaniel K. Szymczak
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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