1
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Nakano R, Yamanashi R, Yamashita M. Base-Stabilized Neutral Oxoborane and Thioxoborane Supported by a Bis(oxazolinyl)(phenyl)methanide Ligand. Chemistry 2023; 29:e202203280. [PMID: 36507866 DOI: 10.1002/chem.202203280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 12/12/2022] [Accepted: 12/12/2022] [Indexed: 12/15/2022]
Abstract
Base-stabilized neutral oxoborane and thioxoborane supported by a bis(oxazolinyl)(phenyl)methanide ligand have been synthesized and structurally characterized. While previous synthetic attempts of oxoborane ligated by β-diketiminate (NacNac) did not allow for its isolation in acid-free form, oxoborane supported by a bis(oxazolinyl)(phenyl)methanide ligand is isolable, due to the absence of imine ɑ-protons and steric protection of enamine carbon. Crystallographic analysis revealed the presence of a B-O double bond close to the shortest end of the reported lengths. Its reactivity has also been examined, and it was majorly governed by the nucleophilicity and basicity of the oxygen atom. The chemical inertness and synthetic convenience of the bis(oxazolinyl)(phenyl)methanide scaffold presented in this work suggest its utility as an innocent alternative to the NacNac scaffold.
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Affiliation(s)
- Ryo Nakano
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Tokai National Higher Education and Research System, Furo-cho, Chikusa-ku, 464-8603, Nagoya, Japan
| | - Ryotaro Yamanashi
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Tokai National Higher Education and Research System, Furo-cho, Chikusa-ku, 464-8603, Nagoya, Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Tokai National Higher Education and Research System, Furo-cho, Chikusa-ku, 464-8603, Nagoya, Japan.,Integrated Research Consortium on Chemical Science (IRCCS), Nagoya University, Tokai National Higher Education and Research System, Furo-cho, Chikusa-ku, 464-8602, Nagoya, Japan
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2
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Erdmann P, Greb L. What Distinguishes the Strength and the Effect of a Lewis Acid: Analysis of the Gutmann-Beckett Method. Angew Chem Int Ed Engl 2022; 61:e202114550. [PMID: 34757692 PMCID: PMC9299668 DOI: 10.1002/anie.202114550] [Citation(s) in RCA: 47] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Indexed: 01/03/2023]
Abstract
IUPAC defines Lewis acidity as the thermodynamic tendency for Lewis pair formation. This strength property was recently specified as global Lewis acidity (gLA), and is gauged for example by the fluoride ion affinity. Experimentally, Lewis acidity is usually evaluated by the effect on a bound molecule, such as the induced 31 P NMR shift of triethylphosphine oxide in the Gutmann-Beckett (GB) method. This type of scaling was called effective Lewis acidity (eLA). Unfortunately, gLA and eLA often correlate poorly, but a reason for this is unknown. Hence, the strength and the effect of a Lewis acid are two distinct properties, but they are often granted interchangeably. The present work analyzes thermodynamic, NMR specific, and London dispersion effects on GB numbers for 130 Lewis acids by theory and experiment. The deformation energy of a Lewis acid is identified as the prime cause for the critical deviation between gLA and eLA but its correction allows a unification for the first time.
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Affiliation(s)
- Philipp Erdmann
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Lutz Greb
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
- Department of Chemistry and Biochemistry—Inorganic ChemistryFreie Universität BerlinFabeckstr. 34/3614195BerlinGermany
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3
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Erdmann P, Greb L. What Distinguishes the Strength and the Effect of a Lewis Acid: Analysis of the Gutmann–Beckett Method. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202114550] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Philipp Erdmann
- Anorganisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Lutz Greb
- Anorganisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
- Department of Chemistry and Biochemistry—Inorganic Chemistry Freie Universität Berlin Fabeckstr. 34/36 14195 Berlin Germany
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4
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Zhao X, Szilvási T, Hanusch F, Inoue S. An Isolable Three-Coordinate Germanone and Its Reactivity. Chemistry 2021; 27:15914-15917. [PMID: 34529306 PMCID: PMC9292218 DOI: 10.1002/chem.202102972] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Indexed: 11/22/2022]
Abstract
A rare three-coordinate germanone [IPrN]2 Ge=O (IPrN=bis(2,6-diisopropylphenyl)imidazolin-2-imino) was successfully isolated. The germanone has a rather high thermal stability in arene solvent, and no detectable change was observed at 80 °C for at least one week. However, high thermal stability of [IPrN]2 Ge=O does not prevent its reactivity toward small molecules. Structural analysis and initial reactivity studies revealed the highly polarized nature of the terminal Ge=O bond. Besides, the addition of phenylacetylene, as well as O-atom transfer with 2,6-dimethylphenyl isocyanide make it a mimic of nucleophilic transition-metal oxides. Mechanism for O-atom transfer reaction was investigated via DFT calculations, which revealed that the reaction proceeds via a [2+2] cycloaddition intermediate.
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Affiliation(s)
- Xuan‐Xuan Zhao
- Department of ChemistryWACKER-Institute of Silicon Chemistry and Catalysis Research CenterTechnische Universität MünchenLichtenbergstraße 485748Garching beiMünchenGermany
| | - Tibor Szilvási
- Department of Chemical and Biological EngineeringUniversity of AlabamaTuscaloosaAL35487USA
| | - Franziska Hanusch
- Department of ChemistryWACKER-Institute of Silicon Chemistry and Catalysis Research CenterTechnische Universität MünchenLichtenbergstraße 485748Garching beiMünchenGermany
| | - Shigeyoshi Inoue
- Department of ChemistryWACKER-Institute of Silicon Chemistry and Catalysis Research CenterTechnische Universität MünchenLichtenbergstraße 485748Garching beiMünchenGermany
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5
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Wang H, Zhang J, Yang J, Xie Z. Synthesis, Structure, and Reactivity of Acid-Free Neutral Oxoborane. Angew Chem Int Ed Engl 2021; 60:19008-19012. [PMID: 34060203 DOI: 10.1002/anie.202106069] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Indexed: 11/09/2022]
Abstract
An efficient synthesis of an acid-free neutral oxoborane of the type carboranyl-B(carbene)=O has been developed via a serendipitous discovery from the reaction of 1,2-[BBr(carbene)]-o-carborane with AgOTf. This represents a new type of oxoborane. The stabilization of this oxoborane may be attributed to 1) kinetic stabilization provided by a bulky 3D carboranyl ligand and 2) thermodynamic stabilization offered by a carbene ligand. Crystallographic analyses support the presence of the shortest terminal B=O double bond ever reported thus far. Its reactivity has also been examined.
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Affiliation(s)
- Hanqiang Wang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Jie Zhang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Jingting Yang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
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6
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Wang H, Zhang J, Yang J, Xie Z. Synthesis, Structure, and Reactivity of Acid‐Free Neutral Oxoborane. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202106069] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Hanqiang Wang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong Shatin, New Territories Hong Kong China
| | - Jie Zhang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong Shatin, New Territories Hong Kong China
| | - Jingting Yang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong Shatin, New Territories Hong Kong China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong Shatin, New Territories Hong Kong China
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7
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Roy MMD, Baird SR, Dornsiepen E, Paul LA, Miao L, Ferguson MJ, Zhou Y, Siewert I, Rivard E. A Stable Homoleptic Divinyl Tetrelene Series. Chemistry 2021; 27:8572-8579. [PMID: 33848023 PMCID: PMC8252546 DOI: 10.1002/chem.202100969] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Indexed: 12/16/2022]
Abstract
The synthesis of the new bulky vinyllithium reagent (Me IPr=CH)Li, (Me IPr=[(MeCNDipp)2 C]; Dipp=2,6-iPr2 C6 H3 ) is reported. This vinyllithium precursor was found to act as a general source of the anionic 2σ, 2π-electron donor ligand [Me IPr=CH]- . Furthermore, a high-yielding route to the degradation-resistant SiII precursor Me IPr⋅SiBr2 is presented. The efficacy of (Me IPr=CH)Li in synthesis was demonstrated by the generation of a complete inorganic divinyltetrelene series (Me IPrCH)2 E: (E=Si to Pb). (Me IPrCH)2 Si: represents the first two-coordinate acyclic silylene not bound by heteroatom donors, with dual electrophilic and nucleophilic character at the SiII center noted. Cyclic voltammetry shows this electron-rich silylene to be a potent reducing agent, rivalling the reducing power of the 19-electron complex cobaltocene (Cp2 Co).
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Affiliation(s)
- Matthew M. D. Roy
- Department of ChemistryUniversity of Alberta11227 Saskatchewan Dr.EdmontonAlbertaT6G 2G2Canada
| | - Samuel R. Baird
- Department of ChemistryUniversity of Alberta11227 Saskatchewan Dr.EdmontonAlbertaT6G 2G2Canada
| | - Eike Dornsiepen
- Department of ChemistryUniversity of Alberta11227 Saskatchewan Dr.EdmontonAlbertaT6G 2G2Canada
| | - Lucas A. Paul
- Universität GöttingenInstitut für Anorganische ChemieTammannstr. 437077GöttingenGermany
| | - Linkun Miao
- Department of ChemistryUniversity of Alberta11227 Saskatchewan Dr.EdmontonAlbertaT6G 2G2Canada
| | - Michael J. Ferguson
- Department of ChemistryUniversity of Alberta11227 Saskatchewan Dr.EdmontonAlbertaT6G 2G2Canada
| | - Yuqiao Zhou
- Department of ChemistryUniversity of Alberta11227 Saskatchewan Dr.EdmontonAlbertaT6G 2G2Canada
| | - Inke Siewert
- Universität GöttingenInstitut für Anorganische ChemieTammannstr. 437077GöttingenGermany
| | - Eric Rivard
- Department of ChemistryUniversity of Alberta11227 Saskatchewan Dr.EdmontonAlbertaT6G 2G2Canada
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8
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Abstract
Main group carbonyl analogues (R2 E=O) derived from p-block elements (E=groups 13 to 15) have long been considered as elusive species. Previously, employment of chemical tricks such as acid- and base-stabilization protocols granted access to these transient species in their masked forms. However, electronic and steric effects inevitably perturb their chemical reactivity and distinguish them from classical carbonyl compounds. A new era was marked by the recent isolation of acid-base free main group carbonyl analogues, ranging from a lighter boracarbonyl to the heavier silacarbonyls, phosphacarbonyls and a germacarbonyl. Most importantly, their unperturbed nature elicits exciting new chemistry, spanning the vista from classical organic carbonyl-type reactions to transition metal-like oxide ion transfer chemistry. In this Review, we survey the strategies used for the isolation of such systems and document their emerging reactivity profiles, with a view to providing fundamental comparisons both with carbon and transition metal oxo species. This highlights the emerging opportunities for exciting "crossover" reactivity offered by these derivatives of the p-block elements.
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Affiliation(s)
- Ying Kai Loh
- Inorganic Chemistry LaboratoryDepartment of ChemistryUniversity of OxfordSouth Parks RoadOxfordOX1 3QRUK
| | - Simon Aldridge
- Inorganic Chemistry LaboratoryDepartment of ChemistryUniversity of OxfordSouth Parks RoadOxfordOX1 3QRUK
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9
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Affiliation(s)
- Ying Kai Loh
- Inorganic Chemistry Laboratory Department of Chemistry University of Oxford South Parks Road Oxford OX1 3QR UK
| | - Simon Aldridge
- Inorganic Chemistry Laboratory Department of Chemistry University of Oxford South Parks Road Oxford OX1 3QR UK
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10
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Zhou J, Liu LL, Cao LL, Stephan DW. Base-Stabilized [PO] + /[PO 2 ] + Cations. Angew Chem Int Ed Engl 2019; 58:18276-18280. [PMID: 31609496 DOI: 10.1002/anie.201912009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Indexed: 01/06/2023]
Abstract
The salts [(BAC)2 PO][BF4 ] (5) and [(BAC)2 PO2 ][BF4 ] (4) (BAC=bis(diisopropylamino) cyclopropenylidene), consisting of the PO+ and PO2 + cations, respectively, coordinated to the singlet carbenes, have been prepared. Computational investigations reveal that the electronic structure of the PO+ cation is a hybrid between the charge-localized and charge-delocalized resonance forms, resulting in ambiphilic reactivity. Compound 5 reacts as a donor with the transition-metal complex K2 PtCl4 to furnish [[(BAC)2 PO]2 PtCl2 ][BF4 ]2 (6) and KCl. Remarkably, both 5 and 4 have shown to act as electrophiles undergoing reactions with fluoride anion, leading to [OPF2 ]- and (BAC)PO2 F, respectively.
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Affiliation(s)
- Jiliang Zhou
- Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, M5S3H6, Canada
| | - Liu Leo Liu
- Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, M5S3H6, Canada
| | - Levy L Cao
- Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, M5S3H6, Canada
| | - Douglas W Stephan
- Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, M5S3H6, Canada
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11
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Zhou J, Liu LL, Cao LL, Stephan DW. Base‐Stabilized [PO]
+
/[PO
2
]
+
Cations. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Jiliang Zhou
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Liu Leo Liu
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Levy L. Cao
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Douglas W. Stephan
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
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12
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Kim Y, Liu LL, Stephan DW. N-Heterocyclic Carbene Derived 3-Azabutadiene as a π-Base in Classic and Frustrated Lewis Pair Chemistry. Chemistry 2019; 25:7110-7113. [PMID: 30968983 DOI: 10.1002/chem.201901609] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Indexed: 11/05/2022]
Abstract
N-Heterocyclic carbene (NHC) derived 3-azabutadienes 1 and 2 have been prepared by a single-step reaction of the corresponding NHC with cyclohexyl isocyanide. Compound 1 features π-basic, delocalized nucleophilic sites over the 3-azabutadiene moiety, therefore allowing for coordinating with small Lewis acids, such as AlCl3 , GaCl3 , and Me2 SAuCl, to form diverse classic Lewis adducts 3-5. Combination of 1 with B(C6 F5 )3 or [Ph3 C][B(C6 F5 )4 ] resulted in single-electron transfer and the obtained radical cation was detected by EPR. In addition, a frustrated Lewis pair comprised of the π-basic 1 and BPh3 effects the splitting of the O-H bond of phenol and the N-H bond of imidazole to give 7 and 8, respectively. An intrinsic bond orbital (IBO) analysis of the pathway leading to 8 showcases the transformation of the delocalized π-electrons of 1 to a newly formed C-H localized σ-bond.
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Affiliation(s)
- Youngsuk Kim
- Department of Chemistry, University of Toronto, 80 St. George St. Toronto, Ontario, M5S3H6, Canada.,Department of Chemistry, Pohang University of Science and Technology, Pohang, 37673, Korea
| | - Liu Leo Liu
- Department of Chemistry, University of Toronto, 80 St. George St. Toronto, Ontario, M5S3H6, Canada
| | - Douglas W Stephan
- Department of Chemistry, University of Toronto, 80 St. George St. Toronto, Ontario, M5S3H6, Canada
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13
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Zhou J, Liu LL, Cao LL, Stephan DW. The Arene‐Stabilized η
5
‐Pentamethylcyclopentadienyl Arsenic Dication [(η
5
‐Cp*)As(toluene)]
2+. Angew Chem Int Ed Engl 2019; 58:5407-5412. [DOI: 10.1002/anie.201902039] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Indexed: 01/10/2023]
Affiliation(s)
- Jiliang Zhou
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Liu Leo Liu
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Levy L. Cao
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Douglas W. Stephan
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
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14
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Zhou J, Liu LL, Cao LL, Stephan DW. The Arene‐Stabilized η
5
‐Pentamethylcyclopentadienyl Arsenic Dication [(η
5
‐Cp*)As(toluene)]
2+. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201902039] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Jiliang Zhou
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Liu Leo Liu
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Levy L. Cao
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Douglas W. Stephan
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
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15
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Loh YK, Ángeles Fuentes M, Vasko P, Aldridge S. Successive Protonation of an N-Heterocyclic Imine Derived Carbonyl: Superelectrophilic Dication Versus Masked Acylium Ion. Angew Chem Int Ed Engl 2018; 57:16559-16563. [PMID: 30354008 DOI: 10.1002/anie.201810709] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 10/22/2018] [Indexed: 01/05/2023]
Abstract
Carbonyl cations are among the most commonly invoked reactive intermediates in organic synthesis. While Olah pioneered superacids to provide a "stable ion" environment for their study in situ, isolated examples are rare. Here, we disclose successive protonation of an N-heterocyclic imine (NHI) derived carbonyl compound (IDippN)2 CO, 2, to the monocation [(IDippN)(IDippNH) CO]+ , [3]+ , and the doubly protonated dication [(IDippNH)2 CO]2+ , [4]2+ . [3]+ represents a rare example of an N-protonated carbonyl cation and [4]2+ the first example of a superelectrophilic carbonyl dication. All three compounds have been characterized by X-ray crystallography and IR spectroscopy, revealing stepwise strengthening of the C=O bond on protonation. The unique stability of these systems is attributed to the enhanced basicity and steric profile provided by the NHI substituents. In addition, we report the related singly NHI-stabilized cation [IDippNCO]+ , [5]+ . Crystallographic and DFT analyses provide insight into the interaction between the carbonyl fragment and the NHI, which reveals that the [CNCO]+ unit (isoelectronic to CCCO) can be described as an acylium cation "masked" as a cumulene.
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Affiliation(s)
- Ying Kai Loh
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK
| | - M Ángeles Fuentes
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK
| | - Petra Vasko
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK
| | - Simon Aldridge
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK
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16
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Liu LL, Cao LL, Zhou J, Stephan DW. Facile Cleavage of the P=P Double Bond in Vinyl-Substituted Diphosphenes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201812592] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Liu Leo Liu
- Department of Chemistry; University of Toronto; 80 St. George Street Toronto Ontario M5S3H6 Canada
| | - Levy L. Cao
- Department of Chemistry; University of Toronto; 80 St. George Street Toronto Ontario M5S3H6 Canada
| | - Jiliang Zhou
- Department of Chemistry; University of Toronto; 80 St. George Street Toronto Ontario M5S3H6 Canada
| | - Douglas W. Stephan
- Department of Chemistry; University of Toronto; 80 St. George Street Toronto Ontario M5S3H6 Canada
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17
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Liu LL, Cao LL, Zhou J, Stephan DW. Facile Cleavage of the P=P Double Bond in Vinyl-Substituted Diphosphenes. Angew Chem Int Ed Engl 2018; 58:273-277. [PMID: 30444313 DOI: 10.1002/anie.201812592] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Indexed: 11/08/2022]
Abstract
The reactions of the cyclic alkyl amino carbene (CAAC) 1 with phosphaalkynes generate the kinetically unstable CAAC-derived phosphirenes 4 and 5, which undergo rearrangement/dimerization reactions to give the vinyl-substituted diphosphenes 2, 3, and 6. The P=P double bond scission of 2 or 3 is unprecedentedly effected by S8 , [AuCl(tht)], or MeOTf at room temperature, which affords a dithiophosphorane 7, a phosphepine Au complex 8, or phosphepinium cations 9 and 10, respectively. The cationic species feature little homoaromaticity while representing the first examples of the phosphorus-containing analogue of the tropylium ion.
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Affiliation(s)
- Liu Leo Liu
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S3H6, Canada
| | - Levy L Cao
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S3H6, Canada
| | - Jiliang Zhou
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S3H6, Canada
| | - Douglas W Stephan
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S3H6, Canada
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18
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Loh YK, Ángeles Fuentes M, Vasko P, Aldridge S. Successive Protonation of an N-Heterocyclic Imine Derived Carbonyl: Superelectrophilic Dication Versus Masked Acylium Ion. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201810709] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ying Kai Loh
- Department of Chemistry; University of Oxford; Inorganic Chemistry Laboratory; South Parks Road Oxford OX1 3QR UK
| | - M. Ángeles Fuentes
- Department of Chemistry; University of Oxford; Inorganic Chemistry Laboratory; South Parks Road Oxford OX1 3QR UK
| | - Petra Vasko
- Department of Chemistry; University of Oxford; Inorganic Chemistry Laboratory; South Parks Road Oxford OX1 3QR UK
| | - Simon Aldridge
- Department of Chemistry; University of Oxford; Inorganic Chemistry Laboratory; South Parks Road Oxford OX1 3QR UK
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19
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Greb L. Lewis Superacids: Classifications, Candidates, and Applications. Chemistry 2018; 24:17881-17896. [DOI: 10.1002/chem.201802698] [Citation(s) in RCA: 133] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Lutz Greb
- Anorganisch-Chemisches InstitutUniversität Heidelberg Im Neuenheimer Feld 270 Germany
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20
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Blavatnik Awards for Young Scientists: K. K. Devaraj, C. E. Diesendruck, and A. L. Goodwin / FCI Dozentenpreise: F. Dielmann, F. Wurm, and B. Morandi. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/anie.201810307] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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21
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Blavatnik‐Preise für junge Wissen‐ schaftler: N. K. Devaraj, C. E. Diesendruck und A. L. Goodwin / FCI‐Dozentenpreise: F. Dielmann, F. Wurm und B. Morandi. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201810307] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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