[Bis(2-pyridyldimethylsilyl)methyl]lithium. New reagent for the stereoselective synthesis of vinylsilanes

The generation of (2-PyMe2Si)(2)CHLi was easily accomplished by the deprotonation of (2-PyMe2Si)(2)CH2 using n-BuLi in Et2O. Thus generated (2-PyMe2Si)(2)CHLi was found to react with a variety of aldehydes and ketones to give the corresponding vinylsilanes in extremely high yields with complete stereoselectivities.