Selective mono-functionalization of 1,1,3,3-tetramethyldisiloxane (TMDSO) with vinyl and allyl metalloids via hydrosilylation reaction is reported. The activities of a number of transition metal catalysts in the reactions between TMDSO and selected unsaturated metalloids were determined, which permitted selection of the most efficient catalysts whose use led to selective formation of monofunctionalized
An alternative route to allylgermanes by the palladium-catalyzed reaction of germylsilanes with allylic halides
作者:Kazuyoshi Ono、Hisao Ishizuka、Taichi Nakano
DOI:10.1016/s0022-328x(99)00308-3
日期:1999.9
Pd(dba)(2) (bis(dibenzylideneacetone)palladium complex) effectively catalyzes the reaction of (dimethylphenylgermyl)trimethylsilane with 2-alkenyl halides to bring about metal-, regio- and stereoselective metathesis resulting in the formation of 2-alkenylphenylgermanes with good yields. On the other hand, the reaction of (chlorodimethylgermyl)trimethylsilane with 2-alkenyl halides is effected by a palladium-phosphine complex to give 2-alkenylchlorogermanes selectively. Germylation of 3,4-dichloro-1-butene with (dimethylphenylgermyl)trimethylsilane forms 1,4-bis(dimethylphenylgermyl)-2-butene with a high yield. (C) 1999 Elsevier Science S.A. All rights reserved.
Palladium-catalyzed metathesis of phenylalkyl- or chloroalkyldigermanes with allylic chlorides at room temperature
ermane) or chloroalkyldigermanes (1,2-dichlorotetraethyl- or 1,2-dichlorotetramethyldigermane) with allylic chlorides proceeds smoothly even at room temperature in the presence of tris(dibenzylideneacetone)dipalladium(0) to afford the corresponding 2-alkenylgermanes in good to high yields.
example of highly efficient platinum-catalyzed hydrosilylation of vinyl- and allylgermanes with different types of silsesquioxanes and spherosilicates. This protocol allows the straightforward introduction of organogermyl functionalities with alkyl chains linked to the silsesquioxane core with good yields and excellent selectivity. These derivatives may be applied as precursors for the development