“…In general, active structures involve molybdenum ions in high-oxidation states; thus, the reactivity of many active species can be modeled with isolated oxomolybdenum species which are stabilized by biologically relevant hard donors, for instance amine, carboxylate, and aryloxido ligands. Similarly, sterically demanding tetradentate diamino bisphenols form active dioxomolybdenum(VI) complexes [5][6][7]. For example, the reactions of MoO 2 Cl 2 derivatives with tetrapodal amine trisphenols or aminoalcohol bisphenols are known to lead to neutral mononuclear oxochloromolybdenum(VI) complexes which can catalyze a number of oxidations including sulfoxidation, epoxidation, and haloperoxidation reactions [3,4].…”