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).
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Brown et al. (1999) studied this question.