1
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Liu X, Dai Y, Bao Q, Li Q, Chen N, Su Y, Wang X. Isolable T-Shaped Planar Silyl Anion. Angew Chem Int Ed Engl 2024; 63:e202406089. [PMID: 38781000 DOI: 10.1002/anie.202406089] [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: 03/29/2024] [Revised: 05/09/2024] [Accepted: 05/23/2024] [Indexed: 05/25/2024]
Abstract
Silyl anions have garnered significant attention due to their synthetic abilities. However, previously reported silyl anions have been limited to either trigonal-pyramidal or trigonal-planar geometries, which confine them primarily as nucleophiles in substitution reactions. Herein, we report the isolation of the unprecedented T-shaped planar silyl anion salt 2 by employment of a geometrically constrained triamido pincer ligand. Theoretical calculations disclosed that the silicon centre in 2 possesses both a lone pair of electrons and an empty 3pz orbital. In addition to nucleophilic substitution reactions with Ph3PAuCl and W(CO)6, 2 readily undergoes oxidative additions with CO2 and 2,6-dimethylphenylisonitrile at room temperature. Furthermore, under mild conditions, compound 2 cleaves Csp2-H, Csp2-H, and H-H bonds in 1,2,4,5-tetrafluorobenzene, an intramolecular iPr group, and dihydrogen, representing the first examples of C-H and H-H activations mediated by a silyl anion, respectively. This work unveils new reactivity of silyl anions owing to the non-classical geometry and electronic structure.
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Affiliation(s)
- Xiaona Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Yuyang Dai
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Qidi Bao
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Qianli Li
- School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252059, China
| | - Ning Chen
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Yuanting Su
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Xinping Wang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032, China
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2
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Higashi T, Kusumoto S, Nozaki K. Cleavage of Si–H and Si–C Bonds by Metal–Ligand Cooperation: Formation of Silyl Anion and Silylene Equivalents from Tertiary Silanes. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Takuya Higashi
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Shuhei Kusumoto
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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3
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Tiessen N, Schwarze N, Stammler HG, Neumann B, Hoge B. Salts of Tris(pentafluoroethyl)silylchalcogenolates [Si(C 2F 5) 3E] - with E = S, Se, and Te: Synthesis, Structure, and Reactivity. Inorg Chem 2021; 60:15112-15117. [PMID: 34591467 DOI: 10.1021/acs.inorgchem.1c02476] [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
Unlike silanolates [SiR3O]- (R = alkyl, aryl), which have been intensely studied, the heavier derivatives [SiR3E]- (E = S, Se, Te) have been much less examined. Among such species, virtually nothing is known about perfluoroalkyl-substituted silylchalcogenolates. In this contribution, a convenient synthesis of tris(pentafluoroethyl)silylchalcogenolate salts [{(Et2N)3P═N}3PN(H)tBu][Si(C2F5)3E] (E = S, Se, Te; tBu = tert-butyl) is presented. All representatives were isolated and fully characterized by multinuclear NMR spectroscopy, IR spectroscopy, mass spectrometry, elemental analysis, and X-ray diffraction studies. Furthermore, first reactivity studies of these novel species toward selected metal halide complexes were performed. In this course, metal complexes [HgPh{SSi(C2F5)3}] (2) and [Au(PPh3){SSi(C2F5)3}] (3) were isolated and characterized.
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Affiliation(s)
- Natalia Tiessen
- Centrum für Molekulare MaterialienFakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, Bielefeld 33615, Germany
| | - Nico Schwarze
- Centrum für Molekulare MaterialienFakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, Bielefeld 33615, Germany
| | - Hans-Georg Stammler
- Centrum für Molekulare MaterialienFakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, Bielefeld 33615, Germany
| | - Beate Neumann
- Centrum für Molekulare MaterialienFakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, Bielefeld 33615, Germany
| | - Berthold Hoge
- Centrum für Molekulare MaterialienFakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, Bielefeld 33615, Germany
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4
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Tiessen N, Keßler M, Neumann B, Stammler H, Hoge B. Nachweis des Lewis‐amphoteren Charakters von Tris(pentafluorethyl)silanid, [Si(C
2
F
5
)
3
]
−. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016455] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Natalia Tiessen
- Universität Bielefeld Fakultät für Chemie Centrum für Molekulare Materialien Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Mira Keßler
- Universität Bielefeld Fakultät für Chemie Centrum für Molekulare Materialien Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Beate Neumann
- Universität Bielefeld Fakultät für Chemie Centrum für Molekulare Materialien Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Hans‐Georg Stammler
- Universität Bielefeld Fakultät für Chemie Centrum für Molekulare Materialien Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Berthold Hoge
- Universität Bielefeld Fakultät für Chemie Centrum für Molekulare Materialien Universitätsstraße 25 33615 Bielefeld Deutschland
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5
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Tiessen N, Keßler M, Neumann B, Stammler H, Hoge B. Evidence of the Lewis-Amphoteric Character of Tris(pentafluoroethyl)silanide, [Si(C 2 F 5 ) 3 ] . Angew Chem Int Ed Engl 2021; 60:12124-12131. [PMID: 33617080 PMCID: PMC8252080 DOI: 10.1002/anie.202016455] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/09/2021] [Indexed: 12/16/2022]
Abstract
According to a first view on the geometrical and electronic structure of the tris(pentafluoroethyl)silanide, this anion appears as a Lewis base. Quantum chemical calculations on perfluoroalkylated silanides show significantly lower HOMO and LUMO energy levels in comparison to their non-fluorinated counterparts, which implies reduced Lewis basicity and increased Lewis acidity of the [Si(C2 F5 )3 ]- ion. With these findings and a HOMO-LUMO gap of 4.80 eV similar to N-heterocyclic silylenes (NHSis), perfluoroalkyl silanides are predestined to exhibit Lewis-amphoteric character similar to silylenes. Deprotonation of Si(C2 F5 )3 H with sterically demanding phosphazene bases afforded thermally stable phosphazenium salts of the [Si(C2 F5 )3 ]- anion, which add to benzaldehyde, benzophenone, CS2 , and CO2 in various manners. This behavior also mirrors the reactivity of silylenes towards ketones as well as heterocumulenes and is rationalized by Lewis amphotericity being inherent in these silanides.
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Affiliation(s)
- Natalia Tiessen
- Universität BielefeldFakultät für ChemieCentrum für Molekulare MaterialienUniversitätsstrasse 2533615BielefeldGermany
| | - Mira Keßler
- Universität BielefeldFakultät für ChemieCentrum für Molekulare MaterialienUniversitätsstrasse 2533615BielefeldGermany
| | - Beate Neumann
- Universität BielefeldFakultät für ChemieCentrum für Molekulare MaterialienUniversitätsstrasse 2533615BielefeldGermany
| | - Hans‐Georg Stammler
- Universität BielefeldFakultät für ChemieCentrum für Molekulare MaterialienUniversitätsstrasse 2533615BielefeldGermany
| | - Berthold Hoge
- Universität BielefeldFakultät für ChemieCentrum für Molekulare MaterialienUniversitätsstrasse 2533615BielefeldGermany
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6
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Klösener J, Wiesemann M, Neumann B, Stammler H, Hoge B. Coordination Chemistry of the Tris(pentafluoroethyl)stannate(II) Anion, [Sn(C
2
F
5
)
3
]
–. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800796] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Johannes Klösener
- Centrum für Molekulare Materialien Fakultät für Chemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Markus Wiesemann
- Centrum für Molekulare Materialien Fakultät für Chemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Beate Neumann
- Centrum für Molekulare Materialien Fakultät für Chemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Hans‐Georg Stammler
- Centrum für Molekulare Materialien Fakultät für Chemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Berthold Hoge
- Centrum für Molekulare Materialien Fakultät für Chemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
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7
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Wiesemann M, Hoge B. Pentafluoroethylated Compounds of Silicon, Germanium and Tin. Chemistry 2018; 24:16457-16471. [PMID: 29722451 DOI: 10.1002/chem.201801292] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 04/24/2018] [Indexed: 11/09/2022]
Abstract
In this contribution we present an account on pentafluoroethylated compounds of silicon, germanium and tin. The pronounced electron-withdrawing effect of the pentafluoroethyl group leads to a markedly increased Lewis acidity at the central atom which results in the stabilization of hypervalent complexes, anionic element(II) species as well as remarkable reactivities of element-element and element-hydrogen bonds. By addition to unsaturated C-C bonds or by reaction with organic halides as well as transition-metal complexes the molecules bearing a pentafluoroethyl-element group are readily accessible. Moreover, the utilization of pentafluoroethyl groups facilitates the formation of donor-stabilized germylenes and stannylenes. A series of such compounds serves as suitable pentafluoroethylation reagents. Conversely to the well-studied trifluoromethyl derivatives these compounds frequently exhibit a higher thermostability, which allows a more convenient handling.
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Affiliation(s)
- Markus Wiesemann
- Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, 33615, Bielefeld, Germany
| | - Berthold Hoge
- Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, 33615, Bielefeld, Germany
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8
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Wiesemann M, Klösener J, Niemann M, Neumann B, Stammler HG, Hoge B. The Tris(pentafluoroethyl)stannate(II) Anion, [Sn(C2F5)3]−-Synthesis and Reactivity. Chemistry 2017; 23:14476-14484. [PMID: 28671288 DOI: 10.1002/chem.201702855] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Markus Wiesemann
- Centrum für Molekulare Materialien, Fakultät für Chemie; Universität Bielefeld; Universitätsstraße 25 33615 Bielefeld Germany
| | - Johannes Klösener
- Centrum für Molekulare Materialien, Fakultät für Chemie; Universität Bielefeld; Universitätsstraße 25 33615 Bielefeld Germany
| | - Mark Niemann
- Centrum für Molekulare Materialien, Fakultät für Chemie; Universität Bielefeld; Universitätsstraße 25 33615 Bielefeld Germany
| | - Beate Neumann
- Centrum für Molekulare Materialien, Fakultät für Chemie; Universität Bielefeld; Universitätsstraße 25 33615 Bielefeld Germany
| | - Hans-Georg Stammler
- Centrum für Molekulare Materialien, Fakultät für Chemie; Universität Bielefeld; Universitätsstraße 25 33615 Bielefeld Germany
| | - Berthold Hoge
- Centrum für Molekulare Materialien, Fakultät für Chemie; Universität Bielefeld; Universitätsstraße 25 33615 Bielefeld Germany
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9
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Schwarze N, Steinhauer S, Neumann B, Stammler HG, Hoge B. Pentafluoroethylsilicic Acids. Angew Chem Int Ed Engl 2016; 55:15528-15530. [DOI: 10.1002/anie.201609097] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Nico Schwarze
- Universität Bielefeld; Fakultät für Chemie; Centrum für Molekulare Materialien; Universitätsstraße 25 33615 Bielefeld Germany
| | - Simon Steinhauer
- Universität Bielefeld; Fakultät für Chemie; Centrum für Molekulare Materialien; Universitätsstraße 25 33615 Bielefeld Germany
| | - Beate Neumann
- Universität Bielefeld; Fakultät für Chemie; Centrum für Molekulare Materialien; Universitätsstraße 25 33615 Bielefeld Germany
| | - Hans-Georg Stammler
- Universität Bielefeld; Fakultät für Chemie; Centrum für Molekulare Materialien; Universitätsstraße 25 33615 Bielefeld Germany
| | - Berthold Hoge
- Universität Bielefeld; Fakultät für Chemie; Centrum für Molekulare Materialien; Universitätsstraße 25 33615 Bielefeld Germany
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10
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Schwarze N, Steinhauer S, Neumann B, Stammler HG, Hoge B. Pentafluorethylkieselsäuren. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201609097] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Nico Schwarze
- Universität Bielefeld; Fakultät für Chemie; Centrum für Molekulare Materialien; Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Simon Steinhauer
- Universität Bielefeld; Fakultät für Chemie; Centrum für Molekulare Materialien; Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Beate Neumann
- Universität Bielefeld; Fakultät für Chemie; Centrum für Molekulare Materialien; Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Hans-Georg Stammler
- Universität Bielefeld; Fakultät für Chemie; Centrum für Molekulare Materialien; Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Berthold Hoge
- Universität Bielefeld; Fakultät für Chemie; Centrum für Molekulare Materialien; Universitätsstraße 25 33615 Bielefeld Deutschland
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