Base-Metal-Catalyzed Regiodivergent Alkene Hydrosilylations

A complementary set of base metal catalysts has been developed for regiodivergent alkene hydrosilylations: iron complexes of phosphine-iminopyridine are selective for anti-Markovnikov hydrosilylations (linear/branched up to > 99:1), while the cobalt complexes bearing the same type of ligands provide an unprecedented high level of Markovnikov selectivity (branched/linear up to > 99:1). Both systems exhibit high efficiency and wide functional group tolerance.