Carbon dioxide palladium-catalyzed reaction with butadiene

The palladium catalyzed reaction of butadiene with carbon dioxide affords mixtures of the cyclic adducts 32 and 33 and linear adducts. The yield of the six-membered ring lactone increases when using a catalyst containing more basic phosphine ligands (PCys, P-i-Prs). ... 

Table 1 Palladium-catalyzed reaction of carbon dioxide with butadiene ...

Addition of water to dienes is catalyzed by palladium complexes. The reaction has been used for synthesizing unsaturated alcohols and ethers from aliphatic conjugated C4 and Cg olefins 248). In particular, the hydration of butadiene with water in the presence of bis(2,4-pentane-dionato)palladium and triphenylphosphine gave 2,7-octadien-l-ol, l,7-octadien-3-ol, and 1,3,5,7-octatetraene 18). The reaction was accelerated by carbon dioxide. Compounds Pd(PPh3)4 and Pd(02C0)-(PPh3)2 were also effective. 

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