The use of the carbon-supported transition-metal catalysts, which are easily available, have been investigated for a wide range of reactions, because of their reliable recyclability and easy removal from reaction media. [¹³] In this paper, we report the α-oxygenation of β-dicarbonyl compounds catalyzed by palladium on carbon (Pd/C). ... Stirring diethyl phenylmalonate (1) in EtOH at room temperature under an oxygen atmosphere (balloon) in the presence of a catalytic amount ...