Metal-catalyzed hydrosilylation procedures provide perhaps the most efficient and economical route to organosilanes, and a variety of catalysts have been developed for this reactions3 Curiously, relatively little effort has been made to develop general, synthetically useful procedures for hydrosilylation of polyolefins and functionalized alkene^.^ In this context we have found that (q5-C5Me5) 2YCH (SiMe3) 2 serves as an efficient and ...