Abstract
Direct oxidative coupling of an alcohol and amine, with air or molecular oxygen as the oxygen source, is an environmentally friendly method for imine synthesis. We developed an Fe catalyst supported on mesoporous carbon (denoted by FeOx/HCMK-3) for this reaction with excellent activity and recyclability. FeOx/HCMK-3 was prepared by impregnating HNO3-treated mesoporous carbon (CMK-3) with iron nitrate solution. The highly dispersed FeOx species give FeOx/HCMK-3 high reducibility and are responsible for the high catalytic performance. Imine synthesis over FeOx/HCMK-3 follows a redox mechanism. The oxygen species in FeOx/HCMK-3 participate in the reaction and are then regenerated by oxidation with molecular O2. The reaction involves two consecutive steps: oxidative dehydrogenation of an alcohol to an aldehyde and coupling of the aldehyde with an amine to give an imine. Oxidative dehydrogenation of the alcohol is the rate-determining step in the reaction.
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