Abstract: Ozonolysis of diene 1 in carbon tetrachloride gave exclusively the keto ester 2, while in methanol the keto olefin 17 was the major product. The behavior of model vinyl ethers 3a, b has revealed that a mechanism involving intramolecular oxygen atom transfer from the carbonyl oxide moiety to a methoxyvinyl group is the most probable for the keto ester formation from diene 1.
