Markovnikov Hydroboration of Perfluoroalkylethylenes

A Markovnikov regioselectivity of 92 % or higher is achieved in the hydroboration of a series of perfluoroalkylethylenes and 2′,3′,4′,5′,6′-pentafluorostyrene with dichloro- and dibromoborane to provide the corresponding (fluoroalkyl)dihaloboranes (see reaction).