Dipyrromethane–diphosphine: the effect of meso substituents on the formation of nickel complexes and on their performance in the transfer hydrogenation of ketones

Abstract

Complex B forms when R = Ph, and both types of complex A and B form when R = Et or cyclohexyl groups. Besides, they catalyze the transfer hydrogenation of a series of aromatic and aliphatic ketones with greater activities when R = Ph.