Highly selective catalytic -hydroboration of alkynes mediated by borenium cations and B(CF).

The -hydroboration of terminal alkynes mediated by borenium cations [NHC(9-BBN)] (NHC = N-heterocyclic carbene, 9-BBN = 9-borabicyclo(3.3.1)nonane) exclusively affords -vinylboranes.