Abstract: The condensation of N-triphenylphosphoraniliden-benzamidine with acyclic a, b- unsaturated aldehydes produces dihydropyrimidines in good to high yields. The methodology has been extended to alicyclic and heterocyclic aldehydes. Key words: amidines, nitrogen-ylids, condensation reactions, dihydropyrimidines, 8pyrimidines
