The role of vanadium and pyridine in heteropolycompounds for the selective oxidation of alcohols with hydrogen peroxide

PALERMO VALERIA; VILLABRILLE PAULA; VAZQUEZ PATRICIA; CÁCERES CARMEN; TUNDO PIETRO; ROMANELLI GUSTAVO

Journal of Chemical Sciences

SPRINGER

Lugar: Florida; Año: 2013 vol. 125 p. 1375 - 1383

This study describes the application of heteropolyacids H3PMo12O40,H4SiMo12O40,H4PMo11VO40, H5PMo10V2O40, H9PMo6V6O40, and a hybrid pyridine-modified heteropolyacid with Keggin structure for selective oxidation of alcohols to ketones or aldehydes using aqueous hydrogen peroxide and acetonitrile as solvent. Performance of these different catalysts in 1-phenylethanol oxidation was studied. Influence of reaction temperature, amount of catalyst and hydrogen peroxide and reaction time on the yield of acetophenone was investigated to obtain optimal reaction conditions. Oxidation ability of the catalystdepended on the number of vanadium atoms present in the Keggin ion and to a lesser extent on pyridine substitution in the Keggin secondary structure. In order to explore the applicability of the method for selective oxidation of alcohols to ketones or aldehydes, various alcohols were investigated according to the general procedure using hybrid pyridine-modified heteropolyacid.