Zero-Valent Amino-Olefin Cobalt Complexes as Catalysts for Oxygen Atom Transfer Reactions from Nitrous Oxide

摘要

The synthesis and characterization of several zero-valent cobalt complexes with a bis(olefin)-amino ligand is presented. Some of these complexes proved to be efficient catalysts for the selective oxidation of secondary and allylic phosphanes, as well as diphosphanes, even with a direct P-P bond. With 5mol% catalyst loadings the oxidations proceed under mild conditions (25-70 degrees C, 7-22h, 2bar N2O) and afford good to excellent yields (65-98%). In this process, the greenhouse gas N2O is catalytically converted into benign N-2 and added-value organophosphorus compounds, some of which are difficult to obtain otherwise.