FORMATION OF C9-CARBOXYLIC ACIDS FROM THE REACTION OF CARBON-DIOXIDE AND BUTADIENE IN THE PRESENCE OF PALLADIUM COMPLEX CATALYSTS AND SODIUM PHENOXIDE

C7-Carboxylic acids were obtained in fairly good yields by the palladium complex-catalyzed reaction of CO2 and butadiene in the presence of PhONa. The yields of C7-carboxylic acids were much higher than those obtained in the reaction carried out in the absence of PhONa. AB catalysts, palladium-monodentate phosphine complexes such as (Ph8P)4Pd were effective. When palladium acetate without phosphine ligand was used as a catalyst the oligomerization of butadiene proceeded, and carboxylated products could not be obtained suggesting that phosphine plays an important role in the insertion of CO2. © 1979, The Chemical Society of Japan. All rights reserved.