Hybrid polyoxotungstates as second-generation POM-based catalysts for microwave-assisted H2O2 activation.
[structure: see text] Organic-inorganic hybrids synthesized from lacunary polyoxotungstates (POMs) have been screened as oxidation catalysts with H2O2 under MW irradiation. Yields up to 99% have been obtained in 25-50 min depending both on the POM structure and on the organic moiety. The reaction scope, optimized with the best performing catalyst [gamma-SiW10O36(PhPO)2]4-, includes epoxidation of terminal and internal double bonds, alcohol oxidation, and sulfoxidation, as well as oxygen transfer to electron-deficient substrates as chalcone, ketones, and sulfoxides.
Carraro
Mauro
M
ITM-CNR and Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy.
Sandei
Luca
L
Sartorel
Andrea
A
Scorrano
Gianfranco
G
Bonchio
Marcella
M