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Iwamoto T, Yin D, Kobayashi A, Tamura M, Motomatsu D, Akasaka N, Yokouchi Y, Ishida S, Kira M. Lithiated 1,3-Disilabicyclo[1.1.0]butanes Synthesized via Selective Cleavage of Exocyclic Si–Si Bonds on Bridgehead Silicon Atoms. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Takeaki Iwamoto
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Dongzhu Yin
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Akifumi Kobayashi
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Makoto Tamura
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Daiki Motomatsu
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Naohiko Akasaka
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Yuki Yokouchi
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Shintaro Ishida
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Mitsuo Kira
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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Kalita AJ, Rohman SS, Kashyap C, Ullah SS, Mazumder LJ, Guha AK. Theoretical Prediction of a Neutral Zero‐Valent Beryllium Compound Isoelectronic with Singlet Carbenes. ChemistrySelect 2020. [DOI: 10.1002/slct.202002415] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Amlan J. Kalita
- Advanced Computational Chemistry CentreDepartment of ChemistryCotton University, Panbazar, Guwahati Assam INDIA- 781001
| | - Shahnaz S. Rohman
- Advanced Computational Chemistry CentreDepartment of ChemistryCotton University, Panbazar, Guwahati Assam INDIA- 781001
| | - Chayanika Kashyap
- Advanced Computational Chemistry CentreDepartment of ChemistryCotton University, Panbazar, Guwahati Assam INDIA- 781001
| | - Sabnam S. Ullah
- Advanced Computational Chemistry CentreDepartment of ChemistryCotton University, Panbazar, Guwahati Assam INDIA- 781001
| | - Lakhya J. Mazumder
- Advanced Computational Chemistry CentreDepartment of ChemistryCotton University, Panbazar, Guwahati Assam INDIA- 781001
| | - Ankur K. Guha
- Advanced Computational Chemistry CentreDepartment of ChemistryCotton University, Panbazar, Guwahati Assam INDIA- 781001
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Bravo-Zhivotovskii D, Ruderfer I, Melamed S, Botoshansky M, Tumanskii B, Apeloig Y. Nonsolvated, aggregated 1,1-dilithiosilane and the derived silyl radicals. Angew Chem Int Ed Engl 2006; 44:739-43. [PMID: 15612070 DOI: 10.1002/anie.200461765] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dmitry Bravo-Zhivotovskii
- Department of Chemistry and the Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel.
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Cortés-Llamas SA, Hernández-Lamoneda R, Velázquez-Carmona MA, Muñoz-Hernández MA, Toscano RA. 3,5-Dimethyl and 3,5-Di-tert-butylpyrazolato Complexes with Alkali Metals: Monomeric, Dimeric, Cluster, and 1D Chain Structures. Inorg Chem 2005; 45:286-94. [PMID: 16390067 DOI: 10.1021/ic051294y] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The pyrazolato complexes [(Me(2)pz)(THF)Li] (1), [((t)Bu(2)pz)Li](4) (2), [((t)Bu(2)pzH)((t)()Bu(2)pz)Li](2) (2a), [(Me(2)pz)Na] (3), [((t)Bu(2)pz)Na](4), [((t)Bu(2)pz)(6)(OH)Na(7)] (4a), [((t)Bu(2)pz)(18-crown-6)Na] (4b), and [((t)Bu(2)pz)K] (5) were synthesized by metalation reactions between R(2)pzH (R = Me, (t)()Bu) and alkyllithium, elemental sodium, or potassium. All the complexes were characterized by spectroscopic methods and microanalysis, and in addition, the crystal structures of 2, 2a, 3, 4a, 4b, and 5 were obtained by single-crystal X-ray diffraction. They show monomeric, dimeric, cluster, and 1D chain structures in the solid state. Ab initio calculations on the structure and stabilities of the monomeric pzM complexes were performed at the MP2 level of theory showing good agreement with the coordination preferences of the pyrazolato ligand to a particular alkali ion.
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Affiliation(s)
- Sara-Angelica Cortés-Llamas
- Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Col. Chamilpa, Cuernavaca, Morelos, México
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Flock M, Marschner C. Silyl Anions or Silylenoids?—A DFT Study of Silyllithium Compounds with π-Donating Substituents. Chemistry 2005; 11:4635-42. [PMID: 15959860 DOI: 10.1002/chem.200401353] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Geometry optimizations at the B3LYP/6-31 + G(d) level for a set of X(SiH3)MeSiLi molecules (X = F, OH, NH2, Cl, SH, and PH2) show that the tetrahedral structure prevails in polar solutions; however, it readily isomerizes into a silylenoid with energy barriers of less than 15 kJ mol(-1). Inverted structures, which predominate in the gas phase, could not be located in solution. Configuration inversion is unfavorable, with energy barriers between 80 and 220 kJ mol(-1). The alpha elimination into a silylene moiety and the corresponding LiX is only likely to occur in solution, particularly for X = Cl and SH.
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Affiliation(s)
- Michaela Flock
- Institute of Inorganic Chemistry, Graz University of Technology, Austria.
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Bravo-Zhivotovskii D, Ruderfer I, Yuzefovich M, Kosa M, Botoshansky M, Tumanskii B, Apeloig Y. Mercury-Substituted Silyl Radical Intermediates in Formation and Fragmentation of Geminal Dimercury Silyl Compounds. Organometallics 2005. [DOI: 10.1021/om050118u] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dmitry Bravo-Zhivotovskii
- Department of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Ilya Ruderfer
- Department of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Michael Yuzefovich
- Department of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Monica Kosa
- Department of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Mark Botoshansky
- Department of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Boris Tumanskii
- Department of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Yitzhak Apeloig
- Department of Chemistry and Lise Meitner-Minerva Center for Computational Quantum Chemistry, Technion−Israel Institute of Technology, Haifa 32000, Israel
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Nanjo M, Nanjo E, Mochida K. Tris(trimethylsilyl)‐Substituted Heavy Group 14‐Element‐Centered Anions: Unsolvated Trimeric Germyllithium and Solvated Dimeric Silyl‐ and Stannyllithiums. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200300919] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Masato Nanjo
- Department of Chemistry, Faculty of Science, Gakushuin University, Mejiro, Toshima‐ku, Tokyo 171‐8588, Japan, Fax: +81‐3‐5992‐1029
| | - Emi Nanjo
- Department of Chemistry, Faculty of Science, Gakushuin University, Mejiro, Toshima‐ku, Tokyo 171‐8588, Japan, Fax: +81‐3‐5992‐1029
| | - Kunio Mochida
- Department of Chemistry, Faculty of Science, Gakushuin University, Mejiro, Toshima‐ku, Tokyo 171‐8588, Japan, Fax: +81‐3‐5992‐1029
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Saulys DA, Powell DR. Synthesis, Experimental/Theoretical Characterization, and Thermolysis Chemistry of CpBe(SiMe3), a Molecule Containing an Unprecedented Beryllium−Silicon Bond. Organometallics 2002. [DOI: 10.1021/om0201720] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dovas A. Saulys
- Department of Chemistry, University of Wisconsin−Madison, Madison, Wisconsin 53706
| | - Douglas R. Powell
- Department of Chemistry, University of Wisconsin−Madison, Madison, Wisconsin 53706
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Nakamoto M, Fukawa T, Lee VY, Sekiguchi A. Nearly planar nonsolvated monomeric silyl- and germyllithiums as a result of an intramolecular CH-Li agostic interaction. J Am Chem Soc 2002; 124:15160-1. [PMID: 12487576 DOI: 10.1021/ja021142r] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pale-yellow crystals of the nonsolvated monomeric silyl- and germyllithiums, tris[di-tert-butyl(methyl)silyl]silyllithium 2a and tris[di-tert-butyl(methyl)silyl]germyllithium 2b, were obtained by one-electron reduction of the corresponding silyl and germyl radicals with lithium in hexane. The crystal structure analysis of both 2a and 2b showed almost planar geometry around the anionic centers, due to both intramolecular CH-Li agostic interactions and steric reasons. However, the free anions [(tBu2MeSi)3Si-][Li+(THF)4] 3a and [(tBu2MeSi)3Ge-][Li+(THF)n] (n = 3, 4) 3b no longer showed a planar geometry, because of the absence of the intramolecular CH-Li agostic interaction. A temperature-dependent 1H NMR study of 2a showed that the CH-Li interaction is weak.
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Affiliation(s)
- Masaaki Nakamoto
- Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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Sekiguchi A, Lee VY, Nanjo M. Lithiosilanes and their application to the synthesis of polysilane dendrimers. Coord Chem Rev 2000. [DOI: 10.1016/s0010-8545(00)00315-5] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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