Silicon(II) Cation Cp*Si:<sup>+</sup>X<sup>–</sup>: A New Class of Efficient Catalysts in Organosilicon Chemistry
作者:Elke Fritz-Langhals
DOI:10.1021/acs.oprd.9b00260
日期:2019.11.15
The catalytic activity of the pentamethylcyclopentadienylsilicon(II) cation Cp*Si:+ was investigated. It was shown that Cp*Si:+ efficiently catalyzes reactions of technical relevance in organosiliconchemistry: Cp*Si:+ proved to be a very efficient nonmetallic catalyst for the hydrosilylation of olefins at low catalyst amounts of <0.01 mol % and for the Piers–Rubinsztajn reaction in order to make controlled
Rhodium-catalyzed transsilylation reactions between bis(trimethylsilyl)ethyne and hexyldimethylsilane
作者:Toshio Suzuki、Itaru Mita
DOI:10.1016/0022-328x(91)86329-o
日期:1991.8
Bis(trimethylsilyl)ethyne and hexyldimethylsilane undergo transsilylationreactions in the presence of Wilkinson's catalyst to give 1-hexyldimethylsilyl-2-trimethylsilylethyne and bis(hexyldimethylsilyl)ethyne. The reaction is faster in air than in argon but oxidation of the silane takes place which significantly reduces the yield.
Iron-Catalysed Chemo-, Regio-, and Stereoselective Hydrosilylation of Alkenes and Alkynes using a Bench-Stable Iron(II) Pre-Catalyst
作者:Mark D. Greenhalgh、Dominik J. Frank、Stephen P. Thomas
DOI:10.1002/adsc.201300827
日期:2014.2.10
AbstractThe chemo‐, regio‐, and stereoselective iron‐catalysed hydrosilylation of alkenes and alkynes with excellent functional group tolerance is reported (34 examples, 41–96% yield). The catalyst and reagents are commercially available and easy to handle, with the active iron catalyst being generated in situ, thus providing a simple and practical methodology for iron‐catalysed hydrosilylation. The silane products can be oxidised to the anti‐Markovnikov product of olefin hydration, and the one‐pot iron‐catalysed hydrosilylation–oxidation of olefins to give silane(di)ols directly is also reported. The iron pre‐catalyst was used at loadings as low as 0.07 mol%, and displayed catalyst turnover frequencies (TOF) approaching 60,000 mol h−1. Initial mechanistic studies indicate an iron(I) active catalyst.magnified image