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Hayakawa N, Sadamori K, Tsujimoto S, Hatanaka M, Wakabayashi T, Matsuo T. Cleavage of a P=P Double Bond Mediated by N-Heterocyclic Carbenes. Angew Chem Int Ed Engl 2017; 56:5765-5769. [PMID: 28429503 DOI: 10.1002/anie.201701201] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Indexed: 11/06/2022]
Abstract
The reaction of the bulky diphosphenes (Rind)P=P(Rind) (1; Rind=1,1,3,3,5,5,7,7-octa-R-substituted s-hydrindacen-4-yl) with two molecules of N-heterocyclic carbene (NHC; 1,3,4,5-tetramethylimidazol-2-ylidene) resulted in the quantitative formation of the NHC-bound phosphinidenes NHC→P(Rind) (2), along with the cleavage of the P=P double bond. The reaction times are dependent on the steric size of the Rind groups (11 days for 2 a (R=Et) and 2 h for 2 b (R=Et, Me) at room temperature). The mechanism for the double bond-breaking is proposed to proceed via the formation of the NHC-coordinated, highly polarized diphospehenes 3 as an intermediate. Approach of a second NHC to 3 induces P-P bond cleavage and P-C bond formation, which proceeds through a transition state with a large negative Gibbs energy change to afford the two molecules of 2, thus being the rate-determining step of the overall reaction with the activation barriers of 80.4 for 2 a and 29.1 kJ mol-1 for 2 b.
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Affiliation(s)
- Naoki Hayakawa
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Kazuya Sadamori
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Shota Tsujimoto
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Miho Hatanaka
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan.,PRESTO (Japan) Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.,Present address: Graduate School of Materials Science and Institute for Research Initiatives, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara, 630-0192, Japan
| | - Tomonari Wakabayashi
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Tsukasa Matsuo
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan
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Doddi A, Bockfeld D, Zaretzke MK, Kleeberg C, Bannenberg T, Tamm M. A modular approach to carbene-stabilized diphosphorus species. Dalton Trans 2017; 46:15859-15864. [DOI: 10.1039/c7dt03436a] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A modular approach has been developed for the synthesis of a series of neutral, cationic and dicationic heteroleptic dicarbene–diphosphorus species.
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Affiliation(s)
- Adinarayana Doddi
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Marc-Kevin Zaretzke
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Christian Kleeberg
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
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Kundu S, Sinhababu S, Dutta S, Mondal T, Koley D, Dittrich B, Schwederski B, Kaim W, Stückl AC, Roesky HW. Synthesis and characterization of Lewis base stabilized mono- and di-organo aluminum radicals. Chem Commun (Camb) 2017; 53:10516-10519. [DOI: 10.1039/c7cc06358j] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis, structure, EPR and theoretical calculations of cyclic (alkyl)(amino)carbene stabilized mononuclear neutral radicals of aluminum containing mono- and di-organo groups.
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Affiliation(s)
- Subrata Kundu
- Universität Göttingen
- Institut für Anorganische Chemie
- Tammannstraße 4
- Göttingen
- Germany
| | - Soumen Sinhababu
- Universität Göttingen
- Institut für Anorganische Chemie
- Tammannstraße 4
- Göttingen
- Germany
| | - Sayan Dutta
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur 741 246
- India
| | - Totan Mondal
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur 741 246
- India
| | - Debasis Koley
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur 741 246
- India
| | - Birger Dittrich
- Anorganische und Strukturchemie
- Heinrich-Heine Universität Düsseldorf
- Universitätsstrasse 1
- D-40225 Düsseldorf
- Germany
| | | | - Wolfgang Kaim
- Universität Stuttgart
- Institut für Anorganische Chemie
- 70569 Stuttgart
- Germany
| | - A. Claudia Stückl
- Universität Göttingen
- Institut für Anorganische Chemie
- Tammannstraße 4
- Göttingen
- Germany
| | - Herbert W. Roesky
- Universität Göttingen
- Institut für Anorganische Chemie
- Tammannstraße 4
- Göttingen
- Germany
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