Efficient Z-Selective Semi-Hydrogenation of Internal Alkynes Catalyzed by Cationic Iron(II) Hydride Complexes

We describe here the application of the well-defined bench-stable cationic aminoborane complex as highly efficient pre-catalysts for the semi-hydrogenation of internal alkynes, 1,3-diynes and 1,3-enynes with molecular hydrogen under mild conditions.