Formation of C₉-Carboxylic Acids from the Reaction of Carbon Dioxide and Butadiene in the Presence of Palladium Complex Catalysts and Sodium Phenoxide

Abstract

C-Carboxylic acids were obtained in fairly good yields by the palladium complex-catalyzed reaction of CO, and butadiene in the presence of PhONa. The yields of C. -carboxylic acids were much higher than those obtained in the reaction carried out in the absence of PhONa. As catalysts, palladium-monodentate phosphine complexes such as (Ph. P), Pd 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 CO.