Stereodivergent Formation of Alkenylsilanes:syn oranti Hydrosilylation of Alkynes Catalyzed by a Cyclopentadienylcobalt(I) Chelate Bearing a Pendant Phosphane Tether
作者:Li Yong、Karin Kirleis、Holger Butenschön
DOI:10.1002/adsc.200606028
日期:2006.5
alkynes is catalyzed by the di-tert-butylphosphanylethylcyclopentadienylcobalt chelate 1. While the reaction of internal alkynes exclusively affords syn hydrosilylation products with triethylsilane, the reaction with triethoxysilane shows predominant anti stereoselectivity. Reactions of terminal alkynes are less selective with triethylsilane and result in cyclotrimerization when triethoxysilane is used
Hydrosilylation of alkynes catalysed by trans- di-µ-hydrido-bis(tertiary phosphine)bis(silyl)diplatinum complexes
作者:Michael Green、John L. Spencer、F. Gordon A. Stone、Constantinos A. Tsipis
DOI:10.1039/dt9770001525
日期:——
diphenylacetylene undergo hydrosilylation in 70–90% yield using diplatinumcomplexes [Pt(SiR3)(µ-H)[(C6H11)3P]}2][SiR3= Si(CH2Ph)Me2, SiCl3, or SiEtMe2] as catalysts. Many of the reactions proceed exothermically after initial warming of the reactants. The stereochemistry of the products from but-1-yne, phenylacetylene, and but-2-yne has been established by 1H n.m.r. spectroscopy. Hydrosilylation of but-1-yne and
Nano-dispersed platinum(0) in organically modified silicate matrices as sustainable catalysts for a regioselective hydrosilylation of alkenes and alkynes
作者:Brett J. Duke、Evan N. Akeroyd、Shreeja V. Bhatt、Chibueze I. Onyeagusi、Shreya V. Bhatt、Brandy R. Adolph、Jean Fotie
DOI:10.1039/c8nj01889h
日期:——
a uniform particles distribution produced higher and consistent yields, while those with poor particles distribution produced lower and almost random yields, suggesting that the uniformity in particle distribution, and by extension the nature of the siloxane matrix, are important for the catalytic properties of these materials. The scope of the reaction was broadened to a range of olefins, with a goal
5-heptanedionato)nickel(II) (1c) as versatile hydrosilylation catalyst precursors is described. Complexes 1a-c catalyze 1,4-selectivehydrosilylation of 1,3-dienes in the presence of NaBHEt3 at ambient temperature. The reactions exhibit good regioselectivity to give the branched isomers as major products. The catalytic system also catalyzes hydrosilylation of alkenes including industriary important siloxy-
Palladiumnanoparticles stabilized with tris‐imidazolium tetrafluoroborates catalyze the stereoselective hydrosilylation of internalalkynes in a dry inert atmosphere to give (E)‐vinylsilanes in excellent yields. In the presence of controlled amounts of water a transfer hydrogenation reaction takes place with the formation of (Z)‐alkenes or the corresponding alkanes.