Oxidovanadium complexes with tridentate aroylhydrazone as catalyst precursors for solvent-free microwave-assisted oxidation of alcohols

Sutradhar, Manas; Martins, Luisa; Silva, Maria de Fátima C. Guedes da; Pombeiro, Armando

http://hdl.handle.net/10400.21/5838

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Authors

Sutradhar, Manas

Martins, Luisa

Silva, Maria de Fátima C. Guedes da

Pombeiro, Armando

Abstract(s)

Aroylhydrazone oxidovanadium compounds, viz, the oxidoethoxidovanadium(V) [VO(OEt)L1] (1) (H2L =salicylaldehyde-2-hydroxybenzoylhydrazone), the salt like dioxidovanadium(V) (NH3CH2CH2OH)(+) [VO2L](-) (2), the mixed-ligand oxidovanadium(V) [VO(hq)L](Hhq = 8-hydroxyquinoline) (3) and the vanadium(IV) [VO(phen)L] (phen=1,10-phenanthroline) (4) complexes (3 and 4 obtained by the first time), have been tested as catalysts for solvent-free microwave-assisted oxidation of aromatic and alicyclic secondary alcohols with tert-butylhydroperoxide. A facile, efficient and selective solvent-free synthesis of ketones was achieved with yields up to 99% (TON= 497, TOF= 993 h(-1) for 3) and 58% (TON =291, TOF= 581 h(-1) for 2) for acetophenone and cyclohexanone, respectively, after 30 min under low power (25W) microwave irradiation. (C) 2015 Elsevier B.V. All rights reserved.

Keywords

Oxidovanadium complexes Aroylhydrazone X-ray structure Microwave-assisted oxidation

URI

http://hdl.handle.net/10400.21/5838

Citation

SUTRADHAR, Manas; [et al.] - Oxidovanadium complexes with tridentate aroylhydrazone as catalyst precursors for solvent-free microwave-assisted oxidation of alcohols. Applied Catalysis-A-General. ISSN. 0926-860X. Vol. 493 (2015), pp. 50-57