Aerobic oxidations of conjugated dienes using a catalytic palladium(II)-quinone-heteropolyacid system for electron transfer from organic substrates to molecular oxygen

摘要: The heteropolyacid H5PMo10V2O40·34H2O was found to be an efficient oxygen activating agent in palladium-catalyzed reactions. Aerobic 1,4-oxidations of conjugated dienes were carried out by employing a triple catalytic system consisting palladium−quinone−heteropolyacid. With this mild electron transfer from the organic substrate molecular occurs. 1,4-Diacyloxylations and 1,4-dialkoxylations studied using reoxidation system. 1,4-Diacetoxylation 1,3-cyclohexadiene some detail. Some advantages over previously employed metal macrocycles are high stability, easy access active catalyst, simpler workup procedures.