N‐coordinated Aluminum Complexes Catalyze the Hydrostannation of Alkynes

The effective catalytic activity of hydrostannation of internal and terminal alkynes has been developed by using aluminum complexes. A novel aluminum complex (LAlMe2)-Al-1 was synthesized and characterized. N-coordinated aluminum complex LAlH2 was chosen to be the most desirable catalyst. Under relatively mild and solvent-free conditions, excellent yields, regio- and stereoselectivities have been achieved. Possible mechanistic pathways for the formation of major products by hydrostannation of alkynes with HSnBu3 were proposed.