Palladium-catalyzed hydrosilylation of silyl-substituted butadienes 1
and 2 with MeSiCl(2)H has been investigated. Both steric effects and t
he presence of an aryl substituent affect the regiochemistry of the hy
drosilylation reaction. Hydrosilylation of siloxane-tethered bis-diene
s 9 exhibits high regio- and diastereoselectivity.