Oxidation of silyl enolates was found to be smoothly catalyzed by [Cu(bpy)(BF4)(2)(H2O)(2)(bpy)](n) (bpy = 4,4'-bipyridine) under molecular oxygen, and provided the corresponding alpha-hydroxy carbonyl compounds in high yield. The insoluble organic-inorganic hybrid polymer was readily recovered by centrifugation after the completion of reaction, and the recovered catalyst could be reused.