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
A novel terphenylphosphine PMe2ArDipp2 (1) (Dipp = 2,6-iPr2C6H3) forms stable Pt(0) complexes with ethene and 3,3-dimethylbut-1-ene that behave as a source of the reactive Pt(PMe2ArDipp2) fragment. The complexes are efficient...
一种新型的三苯膦PMe 2 Ar Dipp2(1)(Dipp = 2,6- i Pr 2 C 6 H 3)与乙烯和3,3-二甲基丁-1-烯形成稳定的Pt(0)络合物,它们作为乙烯的来源反应性Pt(PMe 2 Ar Dipp2)片段。配合物很有效...
Amination of vinylsilanes and vinylgermanes containing an activated double bond
Mixtures of alkyl esters of 2-triethylsilyl(germyl)- and (E)-3-triethylsilyl(germyl)acrylic acids were obtained by hydrosilylation and hydrogermylation of alkyl esters of propiolic acids. Alkyl esters of organosilicon(germanium) β-amino(hydrazino)propionic acids were obtained by amination of the alkyl esters of 2-triethylsilyl(germyl)acrylic acids.
The heterogeneous hydrosilylation of alkynes catalysed by platinum on titania is reported. A variety of hydrosilanes react with both terminal and internal alkynes to furnish the corresponding vinyl silanes in high yields and short reaction times as well as in a regio- and stereoselective manner. The catalyst can be easily recovered and reused in several consecutive cycles. (C) 2010 Elsevier B.V. All rights reserved.
Single-operation synthesis of vinylsilanes from alkenes and hydrosilanes with the aid of Ru3(CO)12