Regio- and Stereochemical Aspects of the Palladium-Catalyzed Desilylation−Arylation of Substituted Vinylsilanes

The palladium-catalyzed desilylation−arylation of substituted vinylsilanes by p-iodoanisole in the presence of bidentate phosphine ligands is described. Apart from enhancing the rate of the reaction considerably, heteroatom-based functional groups in the vinylsilane moiety have a profound influence on the regiochemistry. A catalytic cycle for the chelation-controlled desilylation−arylation reaction involving five- and six-membered chelate rings is proposed.