Zinc-Catalyzed Hydrosilylation and Hydroboration of N‑Heterocycles

The zinc hydride NacNacZnH (2) (NacNac = [Ar′NC­(Me)­CHC­(Me)­NAr′]⁻, Ar′ = 2,6-Me₂C₆H₃) catalyzes regioselective hydrosilylation and hydroboration of pyridines, including the hydroboration of phenanthroline. Mechanistic studies of hydrosilylation, including labeling, kinetic analysis, and density functional theory calculations, suggest the possibility of a reaction pathway based on hydride transfer from an out-of-sphere activated silane.