In this laboratory a novel series of 1-phenyl-3-[4-(2,4-dithio-3-allyl-5-substituted-1,3,5-triazino) aminophenyl]-prop-2-ene-1-ones (IIa-e) was synthesized by the isomerization of 1-phenyl-3-[4-(2-allylimino-4- substitutedimino-1,3,5-dithiazino)aminophenyl] prop-2-ene-1-ones (Ia-e)in 10% aqueous ethanolic sodium bicarbonate medium. The structure of all the synthesized compounds was justified on the basis of chemical characteristics, elemental analysis and spectral analysis.