Dendronized polystyrene supports for new catalytic systems

New catalytic systems based on tris(dimethylvinyl)methyl substituted polystyrene were prepared. Dendronized polystyrenes were obtained by modification of poly(styrene-co-chloromethylstyrene) precursors with LiC(SiMe2CHCH2)3. Platinum was attached to the polymers via coordination to vinyl groups located on carbosilane moieties. Such the catalytic system makes an interesting alternative for heterogenous platinum catalysts (Pt/charcoal, Pt/Cact and Pt/Al2O3) and also to Karstedt’s catalyst, when used in hydrosilylation of vinylsilanes.

New Pt catalytic systems based on poly(styrene)-co-[1,1,1-tris(dimethylvinyl)ethylstyrene] as the polymeric support, were prepared. Modification of poly(styrene-co-chloromethylstyrene) with LiC(SiMe2CHCH2)3 was followed by coordination of platinum to vinyl groups located on carbosilane grafts. The catalytic system was used in hydrosilylation of vinylsilanes, and proved to be an interesting alternative for heterogenous Pt catalysts as well as Karstedt’s catalyst.Figure optionsDownload as PowerPoint slide