Oxidation of alcohols using aqueous hydrogen peroxide assisted by pyridinium salt-Keggin heteropolyacid

P. TUNDO, G. ROMANELLI, P. VILLABRILLE, C. CÁCERES, P. VÁZQUEZ

Dresden, Alemania

Conferencia; 1st International IUPAC Conference on Green Chemistry; 2006

IUPAC

The present work investigates the influence of pyridine salts, with Keggin structure for the selective oxidation of sulfides to sulfoxides or sulfones, it varing to reaction conditions, with H2O2 hydrogen peroxide. The pyridine (Py) salts from H4PMo11VO40, H5PMo10V2O40, H9PMo6V6O40 acids obtained by V substitution in the structure of H3PMo12O40 were synthesized. They were characterized by FT-IR and the variation of their acid properties and that of their original acids was determined by titration with n-butylamine. Vibrational spectrum of primary structure Keggin was modified when Mo+6 atoms were substituted by V+5atoms. The performance of different catalysts on 1-phenylethanol oxidation was studied. The effect of the amount of used hydrogen peroxide was studied in function of conversion time. The different alcohols were used for the oxidation reaction and it was observed that the selectivity depends of initial alcohol. The benzilic alcohols produce excellent yields and with other alcohols, the performance of oxidation reaction is low using the same catalyst.