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1.
S. V. Basenko I. A. Gebel M. G. Voronkov L. V. Klyba R. G. Mirskov 《Russian Chemical Bulletin》1998,47(8):1571-1573
Methyl(vinyl)dichlorosilane reacts with DMSO in the presence of hexamethyldisiloxane to give the corresponding linear oligosiloxanes
of the general formula Me3Si(OSiMeVin)
n
OSiMe3 (n=1–6) as well as MeSi(OSiMe3)3 and Me3Si(MeOSiVin)
m
OSi(OSiMe3)(Me)OSiMe3 (m=1–2). The same reaction in the presence of chlorotrimethylsilane results in oligomers of the general formula Me3Si(OSiMeVin)
n
Cl (n=1–3). A possible scheme of their formation is discussed.
Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 8, pp. 1614–1616, August, 1998. 相似文献
2.
Marcel-Philip Luecke Elron Pens Dr. Shenglai Yao Prof. Dr. Matthias Driess 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(20):4500-4504
The reaction of bis(silylenyl)-substituted ferrocene 1 with two molar equivalents of BPh3 yields the corresponding bis(silylene–borane) Lewis adduct 2 . The latter is capable to activate CO2 to furnish the borane-stabilized bis(silanone) 3 through mono-oxygenation of the dative SiII→B silicon centers under release of CO. Removal of BPh3 from 3 with PMe3 affords the corresponding 1,3,2,4-cyclodisiloxane and the Me3P−BPh3 adduct. All isolated new compounds were characterized and their molecular structures were determined by single-crystal X-ray diffraction analyses. 相似文献
3.
Tossing aldehydes into the ring: The reaction of a silacyclopentadienylidene with aldehydes leads to C=O bond cleavage with the formation of base-stabilized silanones and cyclopropanation of the adjacent C=C bond, followed by silole ring expansion to give silicon analogues of cyclohexadienones. 相似文献
4.
5.
V. N. Khabashesku S. E. Boganov K. N. Kudin J. L. Margrave J. Michl O. M. Nefedov 《Russian Chemical Bulletin》1999,48(11):2003-2015
The recent advances in spectroscopic and quantum-chemical studies of carbene-to-olefin isomerization of carbene analogs of
Group 14 elements are discussed. Primary attention is devoted to the use of matrix isolation spectroscopy, whose successful
combination with modern calculation techniques has resulted in the first spectroscopic characterization of a number of novel
short-lived silylenes and germylenes and their structural isomers with unsaturated Si=C, Ge=C, and Si=O bonds.
Based on invited lecture given by Professor Dr. V. N. Khabashesku at the Sixth International Conference on Chemistry of Carbenes
and Related Intermediates (May 28–30, 1998, St. Petersburg, Russia).
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2027–2039, November, 1999. 相似文献
6.
Alkyltrichlorosilanes react with DMSO (molar ratio 1 : 1 0 °C) to give cyclic oligoalkylchlorosiloxanes of the general formula
[R(Cl)SiO]
n
(where R=Me or Et;n=3–6). With an excess of alkyltrichlorosilane (2: 1), linear oligoalkylchlorosiloxanes Cl[R(Cl)SiO]
m
SiCl2R (where R=Me or Et;m=1–5) are also formed. In the presence of hexamethyldisiloxane (molar ratio Cl3SiR : DMSO: (Me3Si)2O=1:1:2, 20 °C), the reaction products are both cyclic and linear oligoalkyl(trimethylsilyloxy)siloxanes [R(Me3SiO)SiO]
n
(n=3–5) and Me3Si[OSi(OSiMe3)R]
m
OSiMe3 (m=1–3), respectively. The reaction of DMSO with trichloro(vinyl)silane and hexamethyldisiloxane occurs in a similar manner.
A plausible scheme of formation of the final products via intermediate alkylchlorosilanones RClSi=O and alkyl(trimethylsilyloxy)silanones
is discussed.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 361–364, February, 2000. 相似文献
7.
Reversible CO2 Addition to a Si=O Bond and Synthesis of a Persistent SiO2–CO2 Cycloadduct Stabilized by a Lewis Donor–Acceptor Ligand 下载免费PDF全文
Dr. Ricardo Rodriguez Dr. Isabel Alvarado‐Beltran Jérémy Saouli Dr. Nathalie Saffon‐Merceron Dr. Antoine Baceiredo Prof. Vicenç Branchadell Dr. Tsuyoshi Kato 《Angewandte Chemie (International ed. in English)》2018,57(10):2635-2638
The donor‐stabilized sila‐β‐lactone 1 reacts with CO2 via a remarkable reversible [2+2]‐cycloaddition reaction to form the spiro‐cyclic silicon carbonate derivative 2 . Furthermore, photolysis of 2 under pressure of CO2 affords the first persistent SiO2–CO2 cycloadduct 3 , presenting a Si2O4‐like structure, which is stabilized by a Lewis donor–acceptor type ligand. As predicted by theoretical calculations, in marked contrast to the thermodynamically stable SiO2 dimer, the SiO2–CO2 mixed cycloadduct 3 is labile and readily releases CO2. 相似文献
8.
E. A. Chernyshev T. L. Krasnova A. P. Sergeev E. S. Abramova 《Russian Chemical Bulletin》1997,46(9):1586-1589
Pyrolysis of hexamethyldisiloxane (HMDS) and its copyrolysis with chlorotrimethylsilane and tetrachlorosilane were studied.
Based on the data of GLC analysis and on the mass spectrum of the condensate obtained after the pyrolysis of HMDS, it was
concluded that HMDS acts as a source of dimethylsilanone. The results of the copyrolysis of HMDS with chlorotrimethylsilane
used as a trapping reagent indicate that the dimethylsilanone generated from HMDS can be inserted into the Si−Cl and Si−O
bonds. In the copyrolysis of HMDS with tetrachlorosilane serving as a trapping reagent for dimethylsilanone, both dimethylsilanone
and dichlorosilanone are generated.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1663–1666, September, 1997. 相似文献
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