Carbon dioxide-promoted palladium-catalyzed dehydration of primary allylic alcohols: access to substituted 1,3-dienes

1,3-Dienes are versatile synthons and important monomers. Herein we report a carbon dioxide promoted dehydration reaction of primary allylic alcohols to produce substituted 1,3-dienes in good yields. Taking advantage of carbon dioxide as a promoter to facilitate the alcoholic C–O bond cleavage via the formation of an allylic bicarbonate ester, this reaction proceeds under mild conditions.