Bidentate Geometry-Constrained Iminopyridyl Ligands in Cobalt Catalysis: Highly Markovnikov-Selective Hydrosilylation of Alkynes.

Reported herein is a well-defined bidentate geometry-constrained iminopyridyl cobalt complex for an efficient and highly Markovnikov-selective hydrosilylation of alkynes, featuring a broad substrate scope including aromatic/heteroaromatic/aliphatic alkynes and primary/secondary silanes. TON is up to 4950. The kinetic study together with structures clearly revealed that the ligand played the key effect on the efficiency.