Metal-free direct oxidation of α-isophorone to ketoisophorone by I₂ under photoirradiation

Abstract

Molecular iodine was first utilized for direct oxidation of α-isophorone (α-IP) to ketoisophorone (KIP) with molecule oxygen at room temperature and the effects of amount of iodine, solvents and reaction time were investigated extensively. The optimized result shows that 70.2% conversion of α-isophorone and 82.6% selectivity of ketoisophorone are obtained with 15% iodine (molar fraction) in acetonitrile under photoirradiation for 5 h. Moreover, the possible mechanism is proposed.

Keywords

ketoisophorone / aerobic oxidation / iodine / reaction mechanism

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