Convenient synthesis of alkoxyhalosilanes from hydrosilanes
摘要:
Selective dehydrogenative coupling of di- and trihydrosilanes with alcohols catalyzed by PdCl2 or NiCl2 afforded alkoxyhydro- and dialkoxyhydrosilanes in good yield. Further treatment of the resulting alkoxyhydrosilanes with carbon tetrachloride or allyl bromide in the presence of the same catalyst led to the formation of alkoxychloro- and alkoxybromosilanes, respectively. Similar reactions of dialkoxyhydrosilanes with carbon tetrachloride afforded dialkoxychlorosilanes in good yield, although contamination of small amounts of trialkoxysilanes and alkoxydichlorosilanes was detected in the products. Selective substitution of the alkoxyhalosilanes with nucleophiles is also reported. (C) 2004 Elsevier B.V. All rights reserved.
The arene-supported cationic nickel allylcomplexes serve as good catalysts for olefinhydrosilylation at room temperature. Detailed mechanistic studies based on experiments and DFT calculations support the novel mechanism, which...
Lewis Base Catalyzed Selective Chlorination of Monosilanes
作者:Alexander G. Sturm、Julia I. Schweizer、Lioba Meyer、Tobias Santowski、Norbert Auner、Max C. Holthausen
DOI:10.1002/chem.201803921
日期:2018.12.3
A preparatively facile, highly selective synthesis of bifunctional monosilanes R2SiHCl, RSiHCl2 and RSiH2Cl is reported. By chlorination of R2SiH2 and RSiH3 with concentrated HCl/ether solutions, the stepwise introduction of Si−Cl bonds is readily controlled by temperature and reaction time for a broad range of substrates. In a combined experimental and computational study, we establish a new mode
Kinetics of hydride-transfer reactions from hydrosilanes to carbenium ions. Substituent effects in silicenium ions
作者:Herbert Mayr、Nils Basso、Gisela Hagen
DOI:10.1021/ja00034a044
日期:1992.4
varying substitution to para-substituted diarylcarbenium ions have been measured in dichloromethane solution. Generally the reactions follow a second-order rate law, -d[Ar 2 CH + ]/dt=k 2 [Ar 2 CH + ] [HSiR 1 R 2 R 3 ], and k 2 is independent of the degree of ion-pairing and the nature of the counterion (exceptions are reported). The reaction rates are almost independent of solvent polarity
已经在二氯甲烷溶液中测量了氢化物从具有广泛变化的取代基的氢硅烷 HSiR 1 R 2 R 3 到对位取代的二芳基碳鎓离子的转移速率。通常反应遵循二阶速率定律,-d[Ar 2 CH + ]/dt=k 2 [Ar 2 CH + ] [HSiR 1 R 2 R 3 ],k 2 与离子的程度无关-配对和反离子的性质(报告了例外情况)。反应速率几乎与溶剂极性无关
(Salicylaldiminato)Ni(<scp>ii</scp>)-catalysts for hydrosilylation of olefins
A series of (salicylaldiminato)methylnickel complexesefficiently catalyse hydrosilylation of various olefins. The complexes are highlyactive for secondary hydrosilanes and exhibit excellent selectivity for monohydrosilylation. A possible mechanism, which includes a silylnickel complex as a key active species, is proposed.