Abstract
A simple and efficient methodology has been described for the selective oxidation of secondary benzylic alcohols to the corresponding ketones. In contrast, primary benzylic alcohols afforded dimethyl acetals.
Highlights
The mineral perovskite, first described in the 1830s by the geologist Gustav Rose and named by him after the Russian mineralogist Count Lev Aleksevich von Perovski, is denoted by the chemical formula, ABO3 wherein A is rare earth metal having +2 charge and B is transition metal such as Cr, Mn, Fe, Co, etc with +4 charge.[1]
The catalytic applications of perovskite-type oxides include hydrogenation, partial and complete oxidation of lower hydrocarbons, volatile organic compound abatement, NO reduction, fuel cells, benzylation and esterification.1b,2 Due to the interest in the use of environmentally friendly catalysts for organic synthesis, we undertook a study of the utility of perovskite-type oxides for the oxidation of benzylic alcohols
The oxidation of benzylic alcohols to the corresponding carbonyl compounds is a fundamental transformation in organic synthesis.[3]
Summary
The mineral perovskite, first described in the 1830s by the geologist Gustav Rose and named by him after the Russian mineralogist Count Lev Aleksevich von Perovski, is denoted by the chemical formula, ABO3 wherein A is rare earth metal having +2 charge and B is transition metal such as Cr, Mn, Fe, Co, etc with +4 charge.[1]. Among the various perovskite type metal oxides studied, LaCoO3 was found to be very efficient catalyst for the oxidation of secondary benzylic alcohols in combination with 70% aq. TBHP (Scheme 1, table 1).[6] The catalyst LaCoO3 was prepared and characterized according to the known procedure.2b
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