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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.
Lortie et al. (Wed,) studied this question.