Star-shape poly(vinylmethyl-co-dimethyl) siloxanes with carbosilane core-synthesis and application

Abstract

New polymeric supports, that can be used for preparation of novel catalytic systems, were obtained by grafting poly(vinylmethyl-co-dimethyl)siloxane arms onto multifunctional carbosilane moieties which belong to the class of exceptionally sterically hindered tris(silyl)methanes (TSi). Three types of TSimolecules were applied: 3-functional HC(SiMe 2Br)3 (type A), 9-functional HC[SiMe2(CH 2)5-C (SiMe2Br)3]3 (type B) and 4-functional TSi-derivative [SiMe2C(SiMe2Br) 2]2 (type C). The periphery-functionalized carbosilane-siloxane materials offer uniformly distributed and accessible sites for coordination of active catalytic species. New catalytic systems were thus prepared by coordination of platinum to vinyl moieties of the reported polymers, and used in hydrosilylation of vinyltrimethylsilane with 1,1,3,3- Tetramethyldisiloxane. © 2008 Springer Science+Business Media B.V.