Reactions of isobutene, methylenecyclopentane, methylenecyclohexane and methylenecycloheptane with palladiumacetate were studied in acetic acid at 30 to 80°. Two types of oxidation were identified: acetoxylation to allylic acetates (methylenecycloheptane) and oxidativecoupling to dimers (isobutene and methylenecyclohexane). A mechanistic study indicated that the former was produced by thermal decomposition