Air Oxidation of Benzoin Catalyzed by Cu(salen) Supported on Resin D301

A resin bound with Cu(salen), containing 135% Cu (w/w), was prepared by quaternarization of substituted Cu(salen) with tertiary amine group on macroreticular weakly basic styrene type of anionexchange resin (D301).The performance of air oxidation of benzoin catalyzed by the resin was investigated with the method of orthogonal design.Thus,005 mol benzoin was oxidized by air to give 914% yield of benzil at 40 ℃ in 80 mL DMF containing 30 g KOH and 60 g resin after 3 h reaction.This catalyst has the merits of convenient preparation,simple catalytic process ,easy regeneration and repeatable usage.