Reactions of 2,5-Furandicarbaldehyde with Stabilized Phosphonium Ylides. Applications to the Synthesis of 5-Vinyl-2-furaldehyde and 2,5-Divinylfuran Derivatives

By simple modification of the molar proportion of reactants, it was possible to selectively functionalize an aldehyde group in 2,5-furandicarbaldehyde (1), by Wittig reaction with stabilized ylides 2, The scope of the procedure is extended to the preparation of certain furancontaining natural fatty acid analogues.