PALLADIUM-CATALYZED REACTION OF BUTADIENE AND CARBON DIOXIDE

Article abstract of DOI:10.1016/0022-328X(83)87028-4

The selective syntheses of the δ-lactone 2-ethylidene-6-hepten-5-olide and of the γ-lactone 2-ethyl-2,4-heptadien-4-olide by the palladium-catalyzed reaction of carbon dioxide and butadiene are described.Mechanistic studies showed that the formation of the γ-lactone proceeds by a consecutive reaction via the δ-lactone.The products are accounted for in terms of a reaction path involving an allylic palladium carboxylate complex as a key intermediate.