Aerobic oxidation of alcohols to the corresponding carbonyl compounds in the presence of polyoxometalate@TiO2/hydroquinone/palladium@MCF catalytic system

The selective oxidation of alcohols to the corresponding carbonyl compounds is one of the most important reactions in chemical compounds because the corresponding carbonyl compounds are suitable intermediates for the composition of valuable organic compounds.1 In the classic method for the oxidation of alcohol, toxic oxidizing stoichiometric values, such as permanganate and chromium salts, are used, which produce large amounts of toxic waste, and is not economically feasible.2 Among the reported catalysts, palladium salts exhibit high catalytic activity for the reaction of aerobic oxidation of alcohols.3 One of the limitations of these methods is the need for high temperature to react. To overcome this constraint, today researchers using the biometric model of molecules use electron transfer between the catalyst and molecular oxygen as oxidants.4 In this work, for the first time, the selective aerobic oxidation of primary and secondary alcohols to the corresponding carbonyl compounds are investigated using air as an ideal oxidizing agent in the presence of POM@TiO2/HQ/Pd@MCF as a novel cooperative catalyst system under mild conditions (Scheme 1). The main advantages of this method are the use of catalytic amount of supported palladium and polyoxometalate as heterogenuse which can be recycled for several times andthe use of air as an abundant, cost effective and environmentally friendly oxidant.

Keywords:

Aerobic Oxidation , Cooperative catalytic system , Alcohols , Carbonyl compounds