Lewis acid catalyzed stereoselective carbosilylation. Intramolecular trans-vinylsilylation and trans-arylsilylation of unactivated alkynes
Intramolecular trans-vinylsilylation using silicon-tethered alkynylvinylsilanes 3b-c was catalyzed dramatically by Lewis acids such as EtAlCl2 to give the corresponding six-membered silacycles 4b-c in high yields. The reaction proceeded via an
Palladium Catalyzed Reaction of Silacyclobutanes with Acetylenes
Whereas the reaction of 1,1-dimethyl-1-silacyclobutane (1a) with dimethyl acetylenedicarboxylate in the presence of Pd catalyst provides dimethyl 1,1-dimethyl-1-sila-2-cyclohexene-2,3-dicarboxylate almost exclusively, the reaction of 1a with phenylacetyle