Catalytic epoxidation using dioxidomolybdenum(VI) complexes with tridentate aminoalcohol phenol ligands

Abstract

Dedicated to Rabindranath Mukherjee on the occasion of his 65 th birthday, and in recognition of his outstanding contributions to coordination chemistry and bioinorganic chemistry

Amide Functionalized Aminobisphenolato Moo2 and Wo2 Complexes: Synthesis, Characterization, and Alkene Epoxidation Catalysis

“…The tungsten variants W1-W4 had a significantly inferior performance in all epoxidations. In general, the epoxidations followed the trends reported in the literature [9,25,26,28,[32][33][34][35] namely that S1 gives the oxide in high yield and selectively, whereas the oxidation of S2 gives a good conversion with poor selectivity to epoxide, and oxidation of terminal alkene S3 is selective but slow (poor conversion). However, the oxidation of S4 was achieved with moderate conversion and selectivity using Mo1-Mo3, but not Mo4.…”

Bioinspired Mo, W and V complexes bearing a highly hydroxyl-functionalized Schiff base ligand

“…The presence of non-coordinating hydrogen bond/donor acceptor moieties such as alcohols or amides in the outer coordination spheres of various complexes has been associated with heightened catalytic activities of the complexes in some oxidation reactions. [39,40] However, only 3 showed catechol oxidase-like activities, forming 3,5-di-tert-butyl-1,2-benzoquinone (3,5-DTBQ) and 4-tert-butyl-1,2-benzoquinone (4-TBQ), respectively. Moreover, mechanistic studies with regard to vanadium-catalyzed catechol oxidation were performed to further elaborate on the nature of the active catalyst.…”

Influence of Coordination Geometry on the Ring Opening of Benzoxazine: Oxidovanadium(V), Dioxidomolybdenum(VI) and Dioxidotungsten(VI) Complexes of Benzoxazine Based Ligands and their Bio Inspired Catalytic Applications

“…The LMCT band in Mo complexes 11-13 appear at much lower position (ca. 350 nm) and mostly merged with n!π* band while in tungsten complexes (14)(15)(16), other than UV spectral bands, no band was observed in the visible region which could be assigned to LMCT band (Figures S26 and S27). Thus, going from 3d to 5d metal ion the LMCT band experience a systematic blue shift due to continuous energy increment for such transition.…”