“…The macrocyclic ligand in cobaloximes is an almost perfectly planar structure carrying a formal double negative charge. The hydrogen bonding between the two monoanionic covalent halves of the equatorial ligand is sufficient to confer considerable structural rigidity and chemical stability. − The complexes are able to withstand strong acids , and even Grignard reagents . In deuterium oxide solutions, replacement of the bridging hydrogen atom with deuterium is slow even in the presence of bases or acids. , This stability allows the catalysts to be employed in aqueous systems as well as organic media…”