Copper(I)-catalyzed Stereoselective Defluoroborylation of Aliphatic Gem-Difluoroalkenes

This study reports a method for the stereoselective copper(I)-catalyzed defluoroborylation of aliphatic gem-difluoroalkenes to afford (Z)-monofluoro-substituted borylalkenes. Gem-difluoroalkenes bearing a variety of functional groups were efficiently borylated with high stereoselectivity. A theoretical study of the reaction mechanism is also described.