Activation of Hydrogen and Hydrogenation Catalysis by a Borenium Cation

The readily prepared borenium salt [(IiPr2)­(BC8H14)]­[B­(C6F5)4] (2) [IiPr2 = C3H2(NiPr)2] is shown to activate H2 heterolytically in the presence of tBu3P. Compound 2 also acts as a catalyst for the metal-free hydrogenation of imines and enamines at room temperature.