Abstract
Three modes for hydride and proton transfer were observed in the hydrogen transfer step in ketone hydrogenation catalyzed by transition metal-centered diphosphine-diamine complexes. The results indicate that a weaker metal-hydride bond would lead to hydride transfer preceding proton transfer with a low energy barrier, and that a strong M[double bond, length as m-dash]N bond in transition metal amido complexes could increase the energy barrier for the dihydrogen activation step.
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