Methods have been developed for the preparation of substituted 4-pentenals by the rearrangement of allyl alkenyl ethers, produced by the acid-catalyzed elimination of allyl alcohol from aldehyde diallyl acetals. Usually, the allyl alkenyl ethers are produced as transitory intermediates which are not isolated. Some of the reactions and derivatives of the substituted 4-pentenals are discussed.
[DiCosimo, Robert; Moore, Stephen S.; Sowinski, Allan F.; Whitesides, George M. Journal of the American Chemical Society, 1982 , vol. 104, # 1 p. 124 - 133]