Mo(CO)3(CN-t-Bu)3(MoBI3), a New Efficient Catalyst for Regioselective Hydrostannations

Mo(CO)3(NC-t-Bu)3 was found to be a suitable catalyst for the regioselective hydrostannation of several types of alkynes, giving preferentially rise to the α-stannylated products. These products are not available under radical reaction conditions or by using other metal catalysts. This protocol can also be applied to sensitive substrates, which cannot be hydrometalated with the commonly used palladium catalysts.