1
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Merschel A, Vishnevskiy YV, Neumann B, Stammler HG, Ghadwal RS. Boosting the π-Acceptor Property of Mesoionic Carbenes by Carbonylation with Carbon Monoxide. Angew Chem Int Ed Engl 2024; 63:e202318525. [PMID: 38284508 DOI: 10.1002/anie.202318525] [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: 12/03/2023] [Revised: 01/17/2024] [Accepted: 01/17/2024] [Indexed: 01/30/2024]
Abstract
We report the room temperature dimerization of carbon monoxide mediated by C4/C5-vicinal anionic dicarbenes Li(ADC) (ADC = ArC{(Dipp)NC}2 ; Dipp = 2,6-iPr2 C6 H3 ; Ar = Ph, DMP (4-Me2 NC6 H4 ), Bp (4-PhC6 H4 )) to yield (E)-ethene-1,2-bis(olate) (i.e. - O-C=C-O- = COen ) bridged mesoionic carbene (iMIC) lithium compounds COen -[(iMIC)Li]2 (COen -[iMIC]2 = [ArC{(Dipp)NC}2 (CO)]2 ) in quantitative yields. COen -[(iMIC)Li]2 are highly colored stable solids, exhibit a strikingly small HOMO-LUMO energy gap, and readily undergo 2e-oxidations with selenium, CuCl (or CuCl2 ), and AgCl to afford the dinuclear compounds COon -[(iMIC)E]2 (E = Se, CuCl, AgCl) featuring a 1,2-dione bridged neutral bis-iMIC (i.e. COon -[iMIC]2 = [ArC{(Dipp)NC}2 (C=O)]2 ). COen -[(iMIC)Li]2 undergo redox-neutral salt metathesis reactions with LiAlH4 and (Et2 O)2 BeBr2 and afford COen -[(iMIC)AlH2 ]2 and COen -[(iMIC)BeBr]2 , in which the dianionic COen -moiety remains intact. All compounds have been characterized by NMR spectroscopy, mass spectrometry, and X-ray diffraction. Stereoelectronic properties of COon -[iMIC]2 are quantified by experimental and theoretical methods.
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Affiliation(s)
- Arne Merschel
- Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, D-33615, Bielefeld, Germany
| | - Yury V Vishnevskiy
- Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, D-33615, Bielefeld, Germany
| | - Beate Neumann
- Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, D-33615, Bielefeld, Germany
| | - Hans-Georg Stammler
- Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, D-33615, Bielefeld, Germany
| | - Rajendra S Ghadwal
- Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, D-33615, Bielefeld, Germany
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2
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Guthardt R, Jacob HL, Bruhn C, Siemeling U. A complete series of N-heterocyclic tetrylenes (Si-Pb) with a 1,1'-ferrocenediyl backbone enabled by 1,3,2-diazaborolyl N-substituents. Dalton Trans 2023; 52:14380-14389. [PMID: 37781741 DOI: 10.1039/d3dt02684a] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
The use of bulky 1,3,2-diazaborolyl N-substituents has allowed the synthesis of the complete series of ferrocene-based N-heterocyclic tetrylenes fc[(N{B})2E] (fc = 1,1'-ferrocenediyl, {B} = (HCNC6H3-2,6-iPr2)2B, E = Si-Pb). The silylene fc[(N{B})2Si] is inert towards NH3, CO2 or N2O under ambient conditions and thus significantly less reactive than the N-aryl homologue fc[(NC6H3-2,6-iPr2)2Si]. In accord with its higher reactivity, computational results indicate a more pronounced ambiphilicity of fc[(NC6H3-2,6-iPr2)2Si]. Our computational investigation of the model compound fc[(NBMe2)2Si] suggests that silylenes of this type may be superior to fc[(NC6H3-2,6-iPr2)2Si] in terms of ambiphilicity.
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Affiliation(s)
- Robin Guthardt
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Hannes L Jacob
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Clemens Bruhn
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Ulrich Siemeling
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
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3
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Löwe P, Wünsche MA, Purtscher FRS, Gamper J, Hofer TS, Wilm LFB, Röthel MB, Dielmann F. Terminal methylene phosphonium ions: precursors for transient monosubstituted phosphinocarbenes. Chem Sci 2023; 14:7928-7935. [PMID: 37502319 PMCID: PMC10370551 DOI: 10.1039/d3sc02899b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 06/29/2023] [Indexed: 07/29/2023] Open
Abstract
Isolable singlet carbenes are among the most important tools in chemistry, but generally require the interaction of two substituents with the electron deficient carbon atom. We herein report a synthetic approach to monosubstituted phosphinocarbenes via deprotonation of hitherto unknown diprotic terminal methylene phosphonium ions. Two methylene phosphonium salts bearing bulky N-heterocyclic imine substituents at the phosphorus atom were isolated and fully characterized. Deprotonation studies indicate the formation of transient monosubstituted carbenes that undergo intermolecular cycloadditions or intramolecular Buchner ring expansion to afford a cycloheptatriene derivative. The reaction mechanism of the latter transformation was elucidated using DFT calculations, which reveal the ambiphilic nature of the phosphinocarbene enabling the insertion into the aromatic C-C bond. Additional computational studies on the role of substituent effects are presented.
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Affiliation(s)
- Pawel Löwe
- Instutut für Anorganische und Analytische Chemie Universität Münster Corrensstraße 28/30 48149 Münster Germany
| | - Marius A Wünsche
- Instutut für Anorganische und Analytische Chemie Universität Münster Corrensstraße 28/30 48149 Münster Germany
| | - Felix R S Purtscher
- Institute of General, Inorganic and Theoretical Chemistry Leopold-Franzens-Universität Innsbruck Innrain 80-82 6020 Innsbruck Austria
| | - Jakob Gamper
- Institute of General, Inorganic and Theoretical Chemistry Leopold-Franzens-Universität Innsbruck Innrain 80-82 6020 Innsbruck Austria
| | - Thomas S Hofer
- Institute of General, Inorganic and Theoretical Chemistry Leopold-Franzens-Universität Innsbruck Innrain 80-82 6020 Innsbruck Austria
| | - Lukas F B Wilm
- Instutut für Anorganische und Analytische Chemie Universität Münster Corrensstraße 28/30 48149 Münster Germany
| | - Maike B Röthel
- Institute of General, Inorganic and Theoretical Chemistry Leopold-Franzens-Universität Innsbruck Innrain 80-82 6020 Innsbruck Austria
| | - Fabian Dielmann
- Instutut für Anorganische und Analytische Chemie Universität Münster Corrensstraße 28/30 48149 Münster Germany
- Institute of General, Inorganic and Theoretical Chemistry Leopold-Franzens-Universität Innsbruck Innrain 80-82 6020 Innsbruck Austria
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4
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Metal free activation of water and ammonia by neutral tricoordinate pyramidal boron: a computational study. Struct Chem 2022. [DOI: 10.1007/s11224-022-02060-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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5
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Buzsáki D, Nyulászi L, Pietschnig R, Gudat D, Kelemen Z. Bending Ferrocenes with Low Coordinated Bridging Units: The Investigation of Carbenes and Their Analogues with a Ferrocenophane Backbone. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00244] [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)
- Dániel Buzsáki
- Department of Inorganic and Analytical Chemistry, and ELKH-BME Computation Driven Chemistry Research Group, Budapest University of Technology and Economics, Műegyetem rkp 3, H-1111 Budapest, Hungary
| | - László Nyulászi
- Department of Inorganic and Analytical Chemistry, and ELKH-BME Computation Driven Chemistry Research Group, Budapest University of Technology and Economics, Műegyetem rkp 3, H-1111 Budapest, Hungary
| | - Rudolf Pietschnig
- Institut für Chemie und CINSaT, Universität Kassel, Heinrich Plett-Straße 40, 34132 Kassel, Germany
| | - Dietrich Gudat
- Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart, Germany
| | - Zsolt Kelemen
- Department of Inorganic and Analytical Chemistry, and ELKH-BME Computation Driven Chemistry Research Group, Budapest University of Technology and Economics, Műegyetem rkp 3, H-1111 Budapest, Hungary
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6
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Deoxygenating Reduction of CO 2 by [Cp*Al] 4 to Form a (Al 3O 2C) 2 Cluster Featuring Two Ketene Moieties. Inorg Chem 2022; 61:14500-14505. [PMID: 36053858 DOI: 10.1021/acs.inorgchem.2c01587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein we report that the reaction of the low-valent aluminum(I) species [Cp*Al]4 (Cp* = pentamethylcyclopentadienyl) with CO2 exhibits complete cleavages of the C═O bonds. The deoxygenating reduction reaction of [Cp*Al]4 with CO2 at 120 °C afforded [(Cp*)3Al3O2C(CO)]2 (1), which featured two stacked (Al3O2C)2 units and two C═C═O ketene moieties. Moreover, the isoelectronic analogues of diimine and isothiocyanate with CO2 were also investigated, and the reactions of [Cp*Al]4 with Dipp*-N═C═N-Dipp* and Dipp-C═N═S [Dipp* = 2,6-bis(diphenylmethyl)-4-tert-butylphenyl; Dipp = 2,6-diisopropylphenyl] afforded dialuminylimine (2) and tetrameric [Cp*AlS]4 (3), respectively.
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7
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Volk J, Heinz M, Leibold M, Bruhn C, Bens T, Sarkar B, Holthausen MC, Siemeling U. A crystalline cyclic (alkyl)(amino)carbene with a 1,1'-ferrocenylene backbone. Chem Commun (Camb) 2022; 58:10396-10399. [PMID: 36039867 DOI: 10.1039/d2cc03871d] [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
Cyclic (alkyl)(amino)carbenes with a 1,1'-ferrocenylene backbone (fcCAACs) are established as an original family by the preparation of a crystalline congener. The Ccarbene bond angle is unprecedentedly wide for a CAAC, causing an exceptionally pronounced ambiphilicity. The redox-active backbone opens the door to unconventional metalloradicals and oligoradicals.
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Affiliation(s)
- Julia Volk
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
| | - Myron Heinz
- Institut für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Michael Leibold
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
| | - Clemens Bruhn
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
| | - Tobias Bens
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 50659 Stuttgart, Germany
| | - Biprajit Sarkar
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 50659 Stuttgart, Germany
| | - Max C Holthausen
- Institut für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Ulrich Siemeling
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
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8
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Chernyshev VM, Khazipov OV, Shevchenko MA, Pasyukov DV, Burykina JV, Minyaev ME, Eremin DB, Ananikov VP. Discovery of the N–NHC Coupling Process under the Conditions of Pd/NHC- and Ni/NHC-Catalyzed Buchwald–Hartwig Amination. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Victor M. Chernyshev
- Platov South-Russian State Polytechnic University (NPI), Prosveschenya 132, Novocherkassk 346428, Russia
| | - Oleg V. Khazipov
- Platov South-Russian State Polytechnic University (NPI), Prosveschenya 132, Novocherkassk 346428, Russia
| | - Maksim A. Shevchenko
- Platov South-Russian State Polytechnic University (NPI), Prosveschenya 132, Novocherkassk 346428, Russia
| | - Dmitry V. Pasyukov
- Platov South-Russian State Polytechnic University (NPI), Prosveschenya 132, Novocherkassk 346428, Russia
| | - Julia V. Burykina
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia
| | - Mikhail E. Minyaev
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia
| | - Dmitry B. Eremin
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia
| | - Valentine P. Ananikov
- Platov South-Russian State Polytechnic University (NPI), Prosveschenya 132, Novocherkassk 346428, Russia
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia
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9
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Sheppard SA, Bennett TLR, Long NJ. Development and Characterisation of Highly‐Conjugated Functionalised Ferrocenylene Macrocycles. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | | | - Nicholas James Long
- Imperial College of Science Dept. of Chemistry South Kensington SW7 2AZ London UNITED KINGDOM
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10
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Kinzhalov MA, Luzyanin KV. Synthesis and Contemporary Applications of Platinum Group Metals Complexes with Acyclic Diaminocarbene Ligands (Review). RUSS J INORG CHEM+ 2022. [DOI: 10.1134/s0036023622010065] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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11
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Affiliation(s)
- Shiori Fujimori
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching bei München, Germany
| | - Shigeyoshi Inoue
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching bei München, Germany
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12
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Correia Bicho BA, Guthardt R, Bruhn C, Großhennig D, Orth T, Pfeiffer F, Siemeling U. N
‐
tert
‐Alkyl‐Substituted N‐Heterocyclic Carbenes with a 1,1’‐Ferrocenediyl Backbone. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202101014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bruno A. Correia Bicho
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Robin Guthardt
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Clemens Bruhn
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - David Großhennig
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Till Orth
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Florian Pfeiffer
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Ulrich Siemeling
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
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13
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Abstract
The discovery of ferrocene, [Fe(η5-C5H5)2], seventy years ago has significantly influenced chemical research and provided a key impetus for establishing and rapidly expanding organometallic chemistry, which has continued at a...
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14
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Théry V, Molton F, Sirach S, Tillet N, Pécaut J, Tomás-Mendivil E, Martin D. The curious case of a sterically crowded Stenhouse salt. Chem Sci 2022; 13:9755-9760. [PMID: 36091895 PMCID: PMC9400627 DOI: 10.1039/d2sc01895k] [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: 04/01/2022] [Accepted: 07/27/2022] [Indexed: 11/23/2022] Open
Abstract
We report a peculiar Stenhouse salt. It does not evolve into cyclopentenones upon basification, due to the steric hindrance of its bulky stable carbene patterns. This allowed for the observation and characterization of the transient open-chain neutral derivative, which was isolated as its cyclized form. The latter features an unusually long reactive C–O bond (150 pm) and a rich electrochemistry, including oxidation into an air-persistent radical cation. Bulky substituents of a Stenhouse salt prevent the usual formation of a cyclopentenone upon deprotonation. For the first time, a transient open-chain neutral derivative was observed; the cyclized form and an air-persistent radical were isolated.![]()
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Affiliation(s)
| | | | - Selim Sirach
- Univ. Grenoble Alpes, CNRS, DCM Grenoble 38000 France
| | - Neven Tillet
- Univ. Grenoble Alpes, CNRS, DCM Grenoble 38000 France
| | - Jacques Pécaut
- Univ. Grenoble Alpes, CEA, CNRS, INAC-SyMMES, UMR 5819 Grenoble 38000 France
| | | | - David Martin
- Univ. Grenoble Alpes, CNRS, DCM Grenoble 38000 France
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15
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Guthardt R, Blanckenberg J, Bruhn C, Siemeling U. Planar-chiral 1,1'-diaminoferrocenes. Chem Commun (Camb) 2021; 57:12984-12987. [PMID: 34792053 DOI: 10.1039/d1cc05287j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Planar-chiral homologues of 1,1'-diaminoferrocene, which bear a single additional substituent adjacent to one of the amino groups, are prepared as racemic mixtures in a few steps and in good yields from ferrocene. Various substituents relevant to steric shielding, coordination and further functionalisation are used, giving access to ferrocene-based planar-chiral diimines and diamines as well as stable N-heterocyclic carbenes and tetrylenes by transformations analogous to procedures established for 1,1'-diaminoferrocene.
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Affiliation(s)
- Robin Guthardt
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
| | - Johannes Blanckenberg
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
| | - Clemens Bruhn
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
| | - Ulrich Siemeling
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
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16
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Schulz A, Hinz A, Rölke A, Villinger A, Wustrack R. On New Staudinger Type Reactions of Phosphorus Centered Biradicaloids, [P(μ‐NR)]
2
(R = Ter, Hyp), with Ionic and Covalent Azides. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202000228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Axel Schulz
- Anorganische Chemie, Institut für Chemie Universität Rostock Albert‐Einstein‐Str. 3a 18059 Rostock Germany
- Material Design Leibniz‐Institut für Katalyse an der Universität Rostock Albert‐Einstein‐Str. 29a 18059 Rostock Germany
| | - Alexander Hinz
- Anorganische Chemie, Institut für Chemie Universität Rostock Albert‐Einstein‐Str. 3a 18059 Rostock Germany
| | - Anne Rölke
- Anorganische Chemie, Institut für Chemie Universität Rostock Albert‐Einstein‐Str. 3a 18059 Rostock Germany
| | - Alexander Villinger
- Anorganische Chemie, Institut für Chemie Universität Rostock Albert‐Einstein‐Str. 3a 18059 Rostock Germany
| | - Ronald Wustrack
- Anorganische Chemie, Institut für Chemie Universität Rostock Albert‐Einstein‐Str. 3a 18059 Rostock Germany
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17
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Weyer N, Heinz M, Schweizer JI, Bruhn C, Holthausen MC, Siemeling U. A Stable N-Heterocyclic Silylene with a 1,1'-Ferrocenediyl Backbone. Angew Chem Int Ed Engl 2021; 60:2624-2628. [PMID: 33058389 PMCID: PMC7898919 DOI: 10.1002/anie.202011691] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 10/01/2020] [Indexed: 12/14/2022]
Abstract
The N-heterocyclic silylene [{Fe(η5 -C5 H4 -NDipp)2 }Si] (1DippSi, Dipp=2,6-diisopropylphenyl) shows an excellent combination of pronounced thermal stability and high reactivity towards small molecules. It reacts readily with CO2 and N2 O, respectively affording (1DippSiO2 )2 C and (1DippSiO)2 as follow-up products of the silanone 1DippSiO. Its reactions with H2 O, NH3 , and FcPH2 (Fc=ferrocenyl) furnish the respective oxidative addition products 1DippSi(H)X (X=OH, NH2 , PHFc). Its reaction with H3 BNH3 unexpectedly results in B-H, instead of N-H, bond activation, affording 1DippSi(H)(BH2 NH3 ). DFT results suggest that dramatically different mechanisms are operative for these H-X insertions.
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Affiliation(s)
- Nadine Weyer
- Institut für ChemieUniversität KasselHeinrich-Plett-Straße 4034132KasselGermany
| | - Myron Heinz
- Institut für Anorganische und Analytische ChemieGoethe-UniversitätMax-von-Laue-Straße 760438Frankfurt am MainGermany
| | - Julia I. Schweizer
- Institut für Anorganische und Analytische ChemieGoethe-UniversitätMax-von-Laue-Straße 760438Frankfurt am MainGermany
| | - Clemens Bruhn
- Institut für ChemieUniversität KasselHeinrich-Plett-Straße 4034132KasselGermany
| | - Max C. Holthausen
- Institut für Anorganische und Analytische ChemieGoethe-UniversitätMax-von-Laue-Straße 760438Frankfurt am MainGermany
| | - Ulrich Siemeling
- Institut für ChemieUniversität KasselHeinrich-Plett-Straße 4034132KasselGermany
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18
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Weyer N, Heinz M, Schweizer JI, Bruhn C, Holthausen MC, Siemeling U. A Stable N‐Heterocyclic Silylene with a 1,1′‐Ferrocenediyl Backbone. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202011691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nadine Weyer
- Institut für Chemie Universität Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Myron Heinz
- Institut für Anorganische und Analytische Chemie Goethe-Universität Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
| | - Julia I. Schweizer
- Institut für Anorganische und Analytische Chemie Goethe-Universität Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
| | - Clemens Bruhn
- Institut für Chemie Universität Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Max C. Holthausen
- Institut für Anorganische und Analytische Chemie Goethe-Universität Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
| | - Ulrich Siemeling
- Institut für Chemie Universität Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
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19
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Guthardt R, Bruhn C, Färber C, Siemeling U. Effect of the Lead(II) Bond Angle on the Reactivity of Diaminoplumbylenes toward Ammonia: From Inertness to Immediate Ammonolysis. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00196] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robin Guthardt
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - Clemens Bruhn
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - Christian Färber
- Chair of Inorganic and Organometallic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Ulrich Siemeling
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
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20
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21
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Regenauer NI, Jänner S, Wadepohl H, Roşca D. Ein redoxaktives, heterobimetallisches N‐heterocyclisches Carben auf Basis eines Bis(imino)pyrazin‐Liganden. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nicolas I. Regenauer
- Anorganisch-Chemisches Insitut Universität Heidelberg Im Neuenheimer Feld 276 69120 Heidelberg Deutschland
| | - Sven Jänner
- Anorganisch-Chemisches Insitut Universität Heidelberg Im Neuenheimer Feld 276 69120 Heidelberg Deutschland
| | - Hubert Wadepohl
- Anorganisch-Chemisches Insitut Universität Heidelberg Im Neuenheimer Feld 276 69120 Heidelberg Deutschland
| | - Dragoş‐Adrian Roşca
- Anorganisch-Chemisches Insitut Universität Heidelberg Im Neuenheimer Feld 276 69120 Heidelberg Deutschland
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22
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Regenauer NI, Jänner S, Wadepohl H, Roşca D. A Redox-Active Heterobimetallic N-Heterocyclic Carbene Based on a Bis(imino)pyrazine Ligand Scaffold. Angew Chem Int Ed Engl 2020; 59:19320-19328. [PMID: 32672368 PMCID: PMC7590088 DOI: 10.1002/anie.202005865] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Indexed: 11/11/2022]
Abstract
A new redox-active N-heterocyclic carbene (NHC) architecture is obtained using N-methylated pyrazinediimine iron complexes as precursors. The new species exhibit strong π-accepting/σ-donating properties and are able to ligate two metal centres simultaneously. The redox activity was demonstrated by the reversible chemical oxidation of a heterobimetallic Fe0 /RhI example, which affords an isolable ligand-based radical cation. The reversible redox process was then applied in the catalytic hydrosilylation of 4,4'-difluorobenzophenone, where the reaction rate could be reversibly controlled as a function of the catalyst oxidation state. The new NHC exhibits high electrophilicity and nucleophilicity, which was demonstrated in the reversible activation of alcohols and amines. The electronic structure of the resulting complexes was investigated through various spectroscopic and computational methods.
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Affiliation(s)
- Nicolas I. Regenauer
- Anorganisch-Chemisches InstitutUniversität HeidelbergIm Neuenheimer Feld 27669120HeidelbergGermany
| | - Sven Jänner
- Anorganisch-Chemisches InstitutUniversität HeidelbergIm Neuenheimer Feld 27669120HeidelbergGermany
| | - Hubert Wadepohl
- Anorganisch-Chemisches InstitutUniversität HeidelbergIm Neuenheimer Feld 27669120HeidelbergGermany
| | - Dragoş‐Adrian Roşca
- Anorganisch-Chemisches InstitutUniversität HeidelbergIm Neuenheimer Feld 27669120HeidelbergGermany
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23
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Peltier JL, Tomás-Mendivil E, Tolentino DR, Hansmann MM, Jazzar R, Bertrand G. Realizing Metal-Free Carbene-Catalyzed Carbonylation Reactions with CO. J Am Chem Soc 2020; 142:18336-18340. [DOI: 10.1021/jacs.0c09938] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jesse L. Peltier
- UCSD−CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093-0358, United States
| | - Eder Tomás-Mendivil
- UCSD−CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093-0358, United States
- Department of Applied Chemistry, Faculty of Chemistry, University of the Basque Country (UPV-EHU), Donostia-San Sebastián, 20018 Gipuzkoa, Spain
| | - Daniel R. Tolentino
- UCSD−CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093-0358, United States
| | - Max M. Hansmann
- UCSD−CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093-0358, United States
| | - Rodolphe Jazzar
- UCSD−CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093-0358, United States
| | - Guy Bertrand
- UCSD−CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093-0358, United States
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24
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Yenisarı B, Fırıncı R, Özdemir N, Günay ME. Synthesis of ferrocenyl imidazolium salts and their novel PEPPSI-type N-heterocyclic carbene (NHC) palladium complexes. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Delaude L. The Chemistry of Azolium‐Carboxylate Zwitterions and Related Compounds: a Survey of the Years 2009–2020. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000639] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Lionel Delaude
- Laboratory of CatalysisMolSys Research UnitInstitut de Chimie Organique (B6a)Université de Liège Allée du six Août 13 4000 Liège Belgium
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26
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Ghosh B, Phukan AK. Probing the potential of metalla-N-heterocyclic carbenes towards activation of enthalpically strong bonds. Dalton Trans 2020; 49:9505-9515. [PMID: 32608419 DOI: 10.1039/d0dt01363c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Density functional theory calculations are employed to explore the reactivity of metalla-N-heterocyclic carbenes (MNHCs) towards activation of a variety of small molecules (H2, NH3, PH3, SiH3Ph and CH4). All the MNHCs considered are found to have a stable singlet ground state and possess suitable electronic properties for their application in small molecule activation. The calculated energy barriers of E-H (E = H, C, N, Si, P) activation for the MNHCs are found to be in agreement with those of the experimentally evaluated cyclic alkyl(amino)carbene (CAAC) and diamidocarbenes (DACs), thereby indicating the activating effect of the incorporation of an ancillary metal center within a cyclic NHC, and highlighting a new, underexplored strategy in achieving difficult bond activations with carbenes.
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Affiliation(s)
- Bijoy Ghosh
- Department of Chemical Sciences, Tezpur University, Napaam 784028, Assam, India.
| | - Ashwini K Phukan
- Department of Chemical Sciences, Tezpur University, Napaam 784028, Assam, India.
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27
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Tomás‐Mendivil E, Devillard M, Regnier V, Pecaut J, Martin D. Air‐Stable Oxyallyl Patterns and a Switchable N‐Heterocyclic Carbene. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002669] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
| | - Marc Devillard
- Univ. Grenoble Alpes CNRS DCM 38000 Grenoble France
- Current address: Université de Rennes CNRS, ISCR, UMR6226 35042 Rennes France
| | | | - Jacques Pecaut
- Univ. Grenoble Alpes, CEA CNRS, INAC-SyMMES, UMR 5819 38000 Grenoble France
| | - David Martin
- Univ. Grenoble Alpes CNRS DCM 38000 Grenoble France
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28
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Tomás-Mendivil E, Devillard M, Regnier V, Pecaut J, Martin D. Air-Stable Oxyallyl Patterns and a Switchable N-Heterocyclic Carbene. Angew Chem Int Ed Engl 2020; 59:11516-11520. [PMID: 32277582 DOI: 10.1002/anie.202002669] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 04/10/2020] [Indexed: 01/22/2023]
Abstract
Oxyallyl derivatives are typically elusive compounds. Even recently reported "stabilized" 1,3-diaminooxyallyl species are still highly reactive and have short lifetimes at room temperature. Herein, we report the synthesis and preliminary study of mesoionic pyrimidine derivatives that feature 1,3-bis(dimethylamino)oxyallyl patterns with an unprecedented level of stabilization. The latter are not only insensitive towards air and moisture, but they are also compatible with the formation of an ancillary stable N-heterocyclic carbene moiety. As the oxyallyl pattern is proton-responsive, it allows the reversible switching of the electronic properties of the carbene, as a ligand.
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Affiliation(s)
| | - Marc Devillard
- Univ. Grenoble Alpes, CNRS, DCM, 38000, Grenoble, France.,Current address: Université de Rennes, CNRS, ISCR, UMR6226, 35042, Rennes, France
| | | | - Jacques Pecaut
- Univ. Grenoble Alpes, CEA, CNRS, INAC-SyMMES, UMR 5819, 38000, Grenoble, France
| | - David Martin
- Univ. Grenoble Alpes, CNRS, DCM, 38000, Grenoble, France
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29
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Weller S, Schlindwein SH, Feil CM, Kelemen Z, Buzsáki D, Nyulászi L, Isenberg S, Pietschnig R, Nieger M, Gudat D. A Ferrocenophane-Based Diaminophosphenium Ion. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00701] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stefan Weller
- Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart, Germany
| | - Simon H. Schlindwein
- Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart, Germany
| | - Christoph M. Feil
- Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart, Germany
| | - Zsolt Kelemen
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group, Szent Gellért tér 4, 1111 Budapest, Hungary
| | - Dániel Buzsáki
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group, Szent Gellért tér 4, 1111 Budapest, Hungary
| | - László Nyulászi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics and MTA-BME Computation Driven Chemistry Research Group, Szent Gellért tér 4, 1111 Budapest, Hungary
| | - Stefan Isenberg
- Institut für Chemie und CINSaT, Universität Kassel, Heinrich Plett-Straße 40, 34132 Kassel, Germany
| | - Rudolf Pietschnig
- Institut für Chemie und CINSaT, Universität Kassel, Heinrich Plett-Straße 40, 34132 Kassel, Germany
| | - Martin Nieger
- Department of Chemistry, University of Helsinki, P.O. Box 55, 00014 University of Helsinki, Finland
| | - Dietrich Gudat
- Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart, Germany
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30
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Lu B, Song C, Qian W, Wu Z, Császár AG, Zeng X. Heterocumulenic carbene nitric oxide radical OCCNO˙. Chem Commun (Camb) 2019; 55:13510-13513. [PMID: 31584053 DOI: 10.1039/c9cc07056g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The elusive heterocumulenic radical OCCNO˙ and its isotopologues OC13CNO˙ and OCC15NO˙ have been prepared by reacting photolytically generated unsaturated carbene OCC/OC13C with ˙NO/15˙NO in cryogenic N2-, Ar-, and Ne-matrices. Upon UV-light (365 nm) irradiation, the C-C bond in OCCNO˙ breaks and yields a long-sought ground-state radical CNO˙ (X2Π), which has also been identified with matrix-isolation infrared spectroscopy.
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Affiliation(s)
- Bo Lu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China.
| | - Chao Song
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China.
| | - Weiyu Qian
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China.
| | - Zhuang Wu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China.
| | - Attila G Császár
- MTA-ELTE Complex Chemical Systems Research Group, Laboratory of Molecular Structure and Dynamics, Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
| | - Xiaoqing Zeng
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China. and Department of Chemistry, Fudan University, 200433 Shanghai, China.
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31
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Transmetalation from Magnesium–NHCs—Convenient Synthesis of Chelating π-Acidic NHC Complexes. INORGANICS 2019. [DOI: 10.3390/inorganics7050065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The synthesis of chelating N-heterocyclic carbene (NHC) complexes with considerable π-acceptor properties can be a challenging task. This is due to the dimerization of free carbene ligands, the moisture sensitivity of reaction intermediates or reagents, and challenges associated with the workup procedure. Herein, we report a general route using transmetalation from magnesium–NHCs. Notably, this route gives access to transition-metal complexes in quantitative conversion without the formation of byproducts. It therefore produces transition-metal complexes outperforming the conventional routes based on free or lithium-coordinated carbene, silver complexes, or in situ metalation in dimethyl sulfoxide (DMSO). We therefore propose transmetalation from magnesium–NHCs as a convenient and general route to obtain NHC complexes.
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32
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Jonek M, Buhl H, Leibold M, Bruhn C, Siemeling U. Evaluation of benzthiazolidine-based formamidinium salts for the synthesis of penem-type β-lactams by uncatalysed carbonylation of acyclic diaminocarbenes. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2019. [DOI: 10.1515/znb-2019-0017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Abstract
The reaction of [iPr2N=CHCl]Cl with 2-phenylbenzthiazolidine (Ph-BtzH) and subsequent anion metathesis afforded the formamidinium salt [(Ph-Btz)CH(NiPr2)][PF6] ([1aH][PF6]). The reaction of [1aH][PF6] with (Me3Si)2NNa in the presence of grey selenium furnished the selenourea derivative 1aSe as trapping product of the acyclic diaminocarbene 1a. In the absence of selenium, a 2H-1,4-benzothiazine derivative (2) was obtained, which is an isomer of 1a, whose formation is plausibly initiated by deprotonation of [1aH]+ not at the cationic N2CH unit, but at the neighbouring PhCH position. CO was ineffective as trapping reagent for 1a. [1aH][PF6], 1aSe and 2 have been structurally characterised by X-ray diffraction.
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Affiliation(s)
- Markus Jonek
- Institut für Chemie, Universität Kassel , Heinrich-Plett-Straße 40 , 34132 Kassel , Germany
| | - Hannes Buhl
- Institut für Chemie, Universität Kassel , Heinrich-Plett-Straße 40 , 34132 Kassel , Germany
| | - Michael Leibold
- Institut für Chemie, Universität Kassel , Heinrich-Plett-Straße 40 , 34132 Kassel , Germany
| | - Clemens Bruhn
- Institut für Chemie, Universität Kassel , Heinrich-Plett-Straße 40 , 34132 Kassel , Germany
| | - Ulrich Siemeling
- Institut für Chemie, Universität Kassel , Heinrich-Plett-Straße 40 , 34132 Kassel , Germany , Fax: +49 561 804 4777
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33
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Wallbaum L, Schulz T, Bruhn C, Siemeling U. The reaction of a particularly electrophilic acyclic diaminocarbene with carbon monoxide: formation of β- and γ-lactams. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2019. [DOI: 10.1515/znb-2018-0255] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The reaction of carbon monoxide with the acyclic diaminocarbene iPr2N–C–TMP (TMP=2,2,6,6-tetramethylpiperidino), generated in situ from the formamidinium salt [(iPr2N)CH(TMP)][PF6] and NaN(SiMe3)2, unexpectedly afforded a mixture of β- and γ-lactams.
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Affiliation(s)
- Lars Wallbaum
- Institut für Chemie, Universität Kassel , Heinrich-Plett-Straße 40 , 34132 Kassel , Germany
| | - Tim Schulz
- Institut für Chemie, Universität Kassel , Heinrich-Plett-Straße 40 , 34132 Kassel , Germany
| | - Clemens Bruhn
- Institut für Chemie, Universität Kassel , Heinrich-Plett-Straße 40 , 34132 Kassel , Germany
| | - Ulrich Siemeling
- Institut für Chemie, Universität Kassel , Heinrich-Plett-Straße 40 , 34132 Kassel , Germany , Fax: +49 561 804 4777
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34
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Guthardt R, Oetzel J, Schweizer JI, Bruhn C, Langer R, Maurer M, Vícha J, Shestakova P, Holthausen MC, Siemeling U. Reactive Dimerization of an N-Heterocyclic Plumbylene: C-H Activation with Pb II. Angew Chem Int Ed Engl 2019; 58:1387-1391. [PMID: 30457693 DOI: 10.1002/anie.201811559] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Indexed: 11/11/2022]
Abstract
The N-heterocyclic plumbylene [Fe{(η5 -C5 H4 )NSiMe3 }2 Pb:] is in equilibrium with an unprecedented dimer in solution, whose formation involves the cleavage of a strong C-H bond and concomitant formation of a Pb-C and an N-H bond. According to a mechanistic DFT assessment, dimer formation does not involve direct PbII insertion into a cyclopentadienyl C-H bond, but is best described as an electrophilic substitution. The bulkier plumbylene [Fe{(η5 -C5 H4 )NSitBuMe2 }2 Pb:] shows no dimerization, but compensates its electrophilicity by the formation of an intramolecular Fe-Pb bond.
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Affiliation(s)
- Robin Guthardt
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany
| | - Jan Oetzel
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany
| | - Julia I Schweizer
- Institut für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany
| | - Clemens Bruhn
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany
| | - Robert Langer
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, 35043, Marburg, Germany
| | - Martin Maurer
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany
| | - Jan Vícha
- Centre of Polymer Systems, Tomas Bata University in Zlín, Třída T. Bati 5678, 76001, Zlín, Czech Republic
| | - Pavletta Shestakova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Ulica Akad. G. Bonchev, Building 9, 1113, Sofia, Bulgaria
| | - Max C Holthausen
- Institut für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany
| | - Ulrich Siemeling
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany
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35
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Wallbaum L, Weismann D, Löber D, Bruhn C, Prochnow P, Bandow JE, Siemeling U. Stable and Persistent Acyclic Diaminocarbenes with Cycloalkyl Substituents and Their Transformation to β-Lactams by Uncatalysed Carbonylation with CO. Chemistry 2019; 25:1488-1497. [PMID: 30408240 DOI: 10.1002/chem.201805307] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 11/07/2018] [Indexed: 01/07/2023]
Abstract
Four new acyclic diaminocarbenes (ADACs), viz. [(cyclo-Cn H2n-1 )2 N]2 C (n=5-7) and iPr2 N-C-N(cyclo-C6 H11 )2 , were synthesised by reacting the corresponding formamidinium hexafluorophosphates with NaN(SiMe3 )2 . Their nucleophilicities and electrophilicities were respectively judged from the 1 JCH values determined for the N2 CH unit of the corresponding formamidinium cations and from the 77 Se NMR chemical shifts of the selenourea derivatives obtained from the reaction of elemental selenium with the corresponding ADACs. An ambiphilic profile essentially identical to that of the "Alder carbene" (iPr2 N)2 C was found in each case. Similar to the latter carbene, the new ADACs undergo a well-defined thermal decomposition by β-fragmentation, affording an alkene and a formamidine. The stabilities of [(cyclo-Cn H2n-1 )2 N]2 C depend strongly on the value of n, following the order 6>5>7, with the latter congener being too unstable for isolation. [(cyclo-C6 H11 )2 N]2 C shows no thermal decomposition at room temperature in solution and is thus significantly more stable than (iPr2 N)2 C. The stability of iPr2 N-C-N(cyclo-C6 H11 )2 is intermediate between that of (iPr2 N)2 C and [(cyclo-C6 H11 )2 N]2 C, its β-fragmentation selectively affording propene and iPrN=CH-N(cyclo-C6 H11 )2 . [(cyclo-Cn H2n-1 )2 N]2 C (n=5-7) react readily with CO under mild conditions, selectively affording trisubstituted spirocyclic β-lactam derivatives with an antimicrobial activity spectrum similar to that of penicillin G.
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Affiliation(s)
- Lars Wallbaum
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Straße 40, 34132, Kassel, Germany
| | - Daniel Weismann
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Straße 40, 34132, Kassel, Germany
| | - Dennis Löber
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Straße 40, 34132, Kassel, Germany
| | - Clemens Bruhn
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Straße 40, 34132, Kassel, Germany
| | - Pascal Prochnow
- Biology of Microorganisms, Ruhr University Bochum, Universitätsstraße 150, 44801, Bochum, Germany
| | - Julia E Bandow
- Biology of Microorganisms, Ruhr University Bochum, Universitätsstraße 150, 44801, Bochum, Germany
| | - Ulrich Siemeling
- Institute of Chemistry, University of Kassel, Heinrich-Plett-Straße 40, 34132, Kassel, Germany
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36
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Guthardt R, Oetzel J, Schweizer JI, Bruhn C, Langer R, Maurer M, Vícha J, Shestakova P, Holthausen MC, Siemeling U. Reactive Dimerization of an N-Heterocyclic Plumbylene: C−H Activation with PbII. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201811559] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Robin Guthardt
- Institut für Chemie; Universität Kassel; Heinrich-Plett-Strasse 40 34132 Kassel Germany
| | - Jan Oetzel
- Institut für Chemie; Universität Kassel; Heinrich-Plett-Strasse 40 34132 Kassel Germany
| | - Julia I. Schweizer
- Institut für Anorganische und Analytische Chemie; Goethe-Universität; Max-von-Laue-Strasse 7 60438 Frankfurt am Main Germany
| | - Clemens Bruhn
- Institut für Chemie; Universität Kassel; Heinrich-Plett-Strasse 40 34132 Kassel Germany
| | - Robert Langer
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Martin Maurer
- Institut für Chemie; Universität Kassel; Heinrich-Plett-Strasse 40 34132 Kassel Germany
| | - Jan Vícha
- Centre of Polymer Systems; Tomas Bata University in Zlín; Třída T. Bati 5678 76001 Zlín Czech Republic
| | - Pavletta Shestakova
- Institute of Organic Chemistry with Centre of Phytochemistry; Bulgarian Academy of Sciences; Ulica Akad. G. Bonchev, Building 9 1113 Sofia Bulgaria
| | - Max C. Holthausen
- Institut für Anorganische und Analytische Chemie; Goethe-Universität; Max-von-Laue-Strasse 7 60438 Frankfurt am Main Germany
| | - Ulrich Siemeling
- Institut für Chemie; Universität Kassel; Heinrich-Plett-Strasse 40 34132 Kassel Germany
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37
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Ryu Y, Ahumada G, Bielawski CW. Redox- and light-switchable N-heterocyclic carbenes: a “soup-to-nuts” course on contemporary structure–activity relationships. Chem Commun (Camb) 2019; 55:4451-4466. [DOI: 10.1039/c9cc00795d] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This Feature Article offers in-depth, design-to-application discussions of redox-switchable N-heterocyclic carbenes that have been field tested.
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Affiliation(s)
- Yeonkyeong Ryu
- Center for Multidimensional Carbon Materials (CMCM)
- Institute for Basic Science (IBS)
- Ulsan 44919
- Republic of Korea
- Department of Chemistry
| | - Guillermo Ahumada
- Center for Multidimensional Carbon Materials (CMCM)
- Institute for Basic Science (IBS)
- Ulsan 44919
- Republic of Korea
- Department of Chemistry
| | - Christopher W. Bielawski
- Center for Multidimensional Carbon Materials (CMCM)
- Institute for Basic Science (IBS)
- Ulsan 44919
- Republic of Korea
- Department of Chemistry
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38
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Wang Y, Kostenko A, Hadlington TJ, Luecke MP, Yao S, Driess M. Silicon-Mediated Selective Homo- and Heterocoupling of Carbon Monoxide. J Am Chem Soc 2018; 141:626-634. [DOI: 10.1021/jacs.8b11899] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Yuwen Wang
- Metalorganics and Inorganic Materials, Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin, Germany
| | - Arseni Kostenko
- Metalorganics and Inorganic Materials, Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin, Germany
| | - Terrance J. Hadlington
- Metalorganics and Inorganic Materials, Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin, Germany
| | - Marcel-Philip Luecke
- Metalorganics and Inorganic Materials, Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin, Germany
| | - Shenglai Yao
- Metalorganics and Inorganic Materials, Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin, Germany
| | - Matthias Driess
- Metalorganics and Inorganic Materials, Department of Chemistry, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin, Germany
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39
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Ghosh S, Banerjee P, Nandi PK. Heterolytic N H bond activation of ammonia by dinuclear [{M(μ-OMe)}2] complexes (M = Sc – V and Mn – Ni): A theoretical investigation. COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2018.11.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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40
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Devillard M, Regnier V, Tripathi M, Martin D. A computational study of the interplay of steric and electronic effects in the stabilization of 1,3-(diamino)oxyallyls. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.02.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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41
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Kim Y, Lee E. Stable Organic Radicals Derived from N‐Heterocyclic Carbenes. Chemistry 2018; 24:19110-19121. [PMID: 30058298 DOI: 10.1002/chem.201801560] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 06/23/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Youngsuk Kim
- Center for Self-assembly and ComplexityInstitute for Basic Science (IBS) Pohang 37673 Republic of Korea
- Department of ChemistryPohang University of Science and Technology Pohang 37673 Republic of Korea
| | - Eunsung Lee
- Center for Self-assembly and ComplexityInstitute for Basic Science (IBS) Pohang 37673 Republic of Korea
- Department of ChemistryPohang University of Science and Technology Pohang 37673 Republic of Korea
- Division of Advanced Materials SciencePohang University of Science and Technology Pohang 37673 Republic of Korea
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42
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Bharadwaz P, Dewhurst RD, Phukan AK. Metal-Free Activation of Enthalpically Strong Bonds: Unraveling the Potential of Hitherto Unexplored Singlet Carbenes. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800873] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Priyam Bharadwaz
- Department of Chemical Sciences; Tezpur University, Napam -; 784 028 Assam India
| | - Rian D. Dewhurst
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Ashwini K. Phukan
- Department of Chemical Sciences; Tezpur University, Napam -; 784 028 Assam India
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43
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Kargin D, Krekić K, Pietschnig R. Preparation and Molecular Structure of a Series of Bicyclic [3]Ferrocenophanes Containing Pb2
P2
Bridges. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800239] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Denis Kargin
- Institute of Chemistry and CINSaT; University of Kassel; Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Kristijan Krekić
- Institute of Chemistry and CINSaT; University of Kassel; Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Rudolf Pietschnig
- Institute of Chemistry and CINSaT; University of Kassel; Heinrich-Plett-Straße 40 34132 Kassel Germany
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44
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Chernyshev VM, Khazipov OV, Shevchenko MA, Chernenko AY, Astakhov AV, Eremin DB, Pasyukov DV, Kashin AS, Ananikov VP. Revealing the unusual role of bases in activation/deactivation of catalytic systems: O-NHC coupling in M/NHC catalysis. Chem Sci 2018; 9:5564-5577. [PMID: 30061988 PMCID: PMC6048739 DOI: 10.1039/c8sc01353e] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 05/19/2018] [Indexed: 12/20/2022] Open
Abstract
Numerous reactions are catalyzed by complexes of metals (M) with N-heterocyclic carbene (NHC) ligands, typically in the presence of oxygen bases, which significantly shape the performance. It is generally accepted that bases are required for either substrate activation (exemplified by transmetallation in the Suzuki cross-coupling), or HX capture (e.g. in a variety of C-C and C-heteroatom couplings, the Heck reaction, C-H functionalization, heterocyclizations, etc.). This study gives insights into the behavior of M(ii)/NHC (M = Pd, Pt, Ni) complexes in solution under the action of bases conventionally engaged in catalysis (KOH, NaOH, t-BuOK, Cs2CO3, K2CO3, etc.). A previously unaddressed transformation of M(ii)/NHC complexes under conditions of typical base-mediated M/NHC catalyzed reactions is disclosed. Pd(ii) and Pt(ii) complexes widely used in catalysis react with the bases to give M(0) species and 2(5)-oxo-substituted azoles via an O-NHC coupling mechanism. Ni(NHC)2X2 complexes hydrolyze in the presence of aqueous potassium hydroxide, and undergo the same O-NHC coupling to give azolones and metallic nickel under the action of t-BuOK under anhydrous conditions. The study reveals a new role of NHC ligands as intramolecular reducing agents for the transformation of M(ii) into "ligandless" M(0) species. This demonstrates that the disclosed base-mediated O-NHC coupling reaction is integrated into the catalytic M/NHC systems and can define the mechanism of catalysis (molecular M/NHC vs. "NHC-free" cocktail-type catalysis). A proposed mechanism of the revealed transformation includes NHC-OR reductive elimination, as implied by a series of mechanistic studies including 18O labeling experiments.
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Affiliation(s)
- Victor M Chernyshev
- Platov South-Russian State Polytechnic University (NPI) , Prosveschenya 132 , Novocherkassk , 346428 , Russia
| | - Oleg V Khazipov
- Platov South-Russian State Polytechnic University (NPI) , Prosveschenya 132 , Novocherkassk , 346428 , Russia
| | - Maxim A Shevchenko
- Platov South-Russian State Polytechnic University (NPI) , Prosveschenya 132 , Novocherkassk , 346428 , Russia
| | - Andrey Yu Chernenko
- Platov South-Russian State Polytechnic University (NPI) , Prosveschenya 132 , Novocherkassk , 346428 , Russia
| | - Alexander V Astakhov
- Platov South-Russian State Polytechnic University (NPI) , Prosveschenya 132 , Novocherkassk , 346428 , Russia
| | - Dmitry B Eremin
- Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospect 47 , Moscow , 119991 , Russia .
| | - Dmitry V Pasyukov
- Platov South-Russian State Polytechnic University (NPI) , Prosveschenya 132 , Novocherkassk , 346428 , Russia
| | - Alexey S Kashin
- Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospect 47 , Moscow , 119991 , Russia .
| | - Valentine P Ananikov
- Platov South-Russian State Polytechnic University (NPI) , Prosveschenya 132 , Novocherkassk , 346428 , Russia
- Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospect 47 , Moscow , 119991 , Russia .
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Nakagaki M, Baceiredo A, Kato T, Sakaki S. Reversible Oxidative Addition/Reductive Elimination of a Si−H Bond with Base-Stabilized Silylenes: A Theoretical Insight. Chemistry 2018; 24:11377-11385. [DOI: 10.1002/chem.201801369] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Masayuku Nakagaki
- Fukui Institute for Fundamental Chemistry; Kyoto University; Takano-Nishi-hiraki-cho 34-4 Sakyo-ku Kyoto 606-8103 Japan
| | - Antoine Baceiredo
- Université de Toulouse, UPS, and CNRS, LHFA UMR 5069; F-31062 Toulouse France
| | - Tsuyoshi Kato
- Université de Toulouse, UPS, and CNRS, LHFA UMR 5069; F-31062 Toulouse France
| | - Shigeyoshi Sakaki
- Fukui Institute for Fundamental Chemistry; Kyoto University; Takano-Nishi-hiraki-cho 34-4 Sakyo-ku Kyoto 606-8103 Japan
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46
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Nesterov V, Reiter D, Bag P, Frisch P, Holzner R, Porzelt A, Inoue S. NHCs in Main Group Chemistry. Chem Rev 2018; 118:9678-9842. [PMID: 29969239 DOI: 10.1021/acs.chemrev.8b00079] [Citation(s) in RCA: 508] [Impact Index Per Article: 84.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Since the discovery of the first stable N-heterocyclic carbene (NHC) in the beginning of the 1990s, these divalent carbon species have become a common and available class of compounds, which have found numerous applications in academic and industrial research. Their important role as two-electron donor ligands, especially in transition metal chemistry and catalysis, is difficult to overestimate. In the past decade, there has been tremendous research attention given to the chemistry of low-coordinate main group element compounds. Significant progress has been achieved in stabilization and isolation of such species as Lewis acid/base adducts with highly tunable NHC ligands. This has allowed investigation of numerous novel types of compounds with unique electronic structures and opened new opportunities in the rational design of novel organic catalysts and materials. This Review gives a general overview of this research, basic synthetic approaches, key features of NHC-main group element adducts, and might be useful for the broad research community.
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Affiliation(s)
- Vitaly Nesterov
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center , Technische Universität München , Lichtenbergstrasse 4 , Garching bei München 85748 , Germany
| | - Dominik Reiter
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center , Technische Universität München , Lichtenbergstrasse 4 , Garching bei München 85748 , Germany
| | - Prasenjit Bag
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center , Technische Universität München , Lichtenbergstrasse 4 , Garching bei München 85748 , Germany
| | - Philipp Frisch
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center , Technische Universität München , Lichtenbergstrasse 4 , Garching bei München 85748 , Germany
| | - Richard Holzner
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center , Technische Universität München , Lichtenbergstrasse 4 , Garching bei München 85748 , Germany
| | - Amelie Porzelt
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center , Technische Universität München , Lichtenbergstrasse 4 , Garching bei München 85748 , Germany
| | - Shigeyoshi Inoue
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center , Technische Universität München , Lichtenbergstrasse 4 , Garching bei München 85748 , Germany
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47
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Oetzel J, Bruhn C, Siemeling U. On the Way to N-Heterocyclic Silylenes with a 1,1′-Ferrocenediyl Backbone: Synthesis and Structures of Silicon(IV) Compounds of the Type [Fe{(η5-C5H4)NR}2SiX2]. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800152] [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)
- Jan Oetzel
- Institute of Chemistry; University of Kassel; Heinrich-Plett-Str. 40 34132 Kassel Germany
| | - Clemens Bruhn
- Institute of Chemistry; University of Kassel; Heinrich-Plett-Str. 40 34132 Kassel Germany
| | - Ulrich Siemeling
- Institute of Chemistry; University of Kassel; Heinrich-Plett-Str. 40 34132 Kassel Germany
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48
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Regnier V, Molton F, Philouze C, Martin D. An air-persistent oxyallyl radical cation with simple di(methyl)amino substituents. Chem Commun (Camb) 2018; 52:11422-11425. [PMID: 27722255 DOI: 10.1039/c6cc06260a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report an experimental and theoretical study of the 1,1,3,3-tetrakis-di(methylamino)oxyallyl radical cation. Despite simple substituents with minimal steric hindrance, this radical was found to be stable under an inert atmosphere and persistent for several hours in well-aerated solutions.
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Affiliation(s)
- Vianney Regnier
- Département de Chimie Moléculaire, UMR CNRS 5250, Université Grenoble-Alpes B. P. 53, 38041 Cedex 9 Grenoble, France.
| | - Florian Molton
- Département de Chimie Moléculaire, UMR CNRS 5250, Université Grenoble-Alpes B. P. 53, 38041 Cedex 9 Grenoble, France.
| | - Christian Philouze
- Département de Chimie Moléculaire, UMR CNRS 5250, Université Grenoble-Alpes B. P. 53, 38041 Cedex 9 Grenoble, France.
| | - David Martin
- Département de Chimie Moléculaire, UMR CNRS 5250, Université Grenoble-Alpes B. P. 53, 38041 Cedex 9 Grenoble, France.
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49
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Tripathi M, Regnier V, Ziani Z, Devillard M, Philouze C, Martin D. Metal free oxidation of vinamidine derivatives: a simple synthesis of α-keto-β-diimine ligands. RSC Adv 2018; 8:38346-38350. [PMID: 35559111 PMCID: PMC9089801 DOI: 10.1039/c8ra08220k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 11/08/2018] [Indexed: 11/21/2022] Open
Abstract
Oxidation of vinamidinium salts with meta-chloroperbenzoic acid is the key synthetic step towards new persistent 1,3-di(amino)oxyallyl radical cations. When applied to parent vinamidines, this protocol allows for a simple straightforward synthesis of α-keto-β-diimine ligands, for which no convenient synthesis was previously available. Oxidation of vinamidinium salts with meta-chloroperbenzoic acid not only provides access to new persistent 1,3-di(amino)oxyallyl radical cations, but also to α-keto-β-diimine ligands, for which no convenient synthesis was previously available.![]()
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50
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Yang CF, Lu T, Chen XT, Xue ZL. Unusual rearrangement of an N-heterocyclic carbene viaa ring-opening and ring-closing process. Chem Commun (Camb) 2018; 54:7830-7833. [DOI: 10.1039/c8cc03589j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The reaction of a pentadentate NHC ligand precursor with Ni(OAc)2·4H2O or Pd(OAc)2in the presence of a base yields four-coordinate square-planar Ni(ii) and Pd(ii) complexes with an unusual ligand generatedin situ.
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Affiliation(s)
- Chu-Fan Yang
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Taotao Lu
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Xue-Tai Chen
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Zi-Ling Xue
- Department of Chemistry
- University of Tennessee
- Knoxville
- USA
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