On the Way to a New Class of Catalysts—High‐Valent Transition‐Metal Complexes That Catalyze Reductions

Surprise! Owing to its rhenium(V) center, which bears two terminal oxo ligands, [ReI(O)2(PPh3)2] appears at first glance to be an oxygen-transfer reagent. The complex is, however, a novel catalyst for a reduction: the hydrosilylation of aldehydes and ketones (see scheme).