Dihydrogen activation at zinc is an unusual observation. Although there have been previous reports of the use of zinc-based catalysts for hydrogenation, the fundamental understanding of this process has received limited attention. For example, Beller and coworkers reported the use of zinc triflate, Zn(OTf)2, as a pre-catalyst for the hydrogenation of imines. Stephan and coworkers also used a zinc-based catalyst for the hydrogenation of imines and ketones. Milstein and coworkers provided an example of zinc catalyzed hydrogenation of imines and ketones, using a PNP pincer ligand to facilitate dihydrogen activation through metal-ligand cooperation. Despite these reports, the application of zinc to hydrogenation catalysis remains understudied, with substrates limited to highly polarized species.