Merocyanines Derived from 1, 3-Diphenyl-6-oxo-Pyridazine

1,3-Diphenyl-6-oxo-pyridazine was condensed separately with diphenyl formamidine and betaanihno acrolein anil hydrochloride. The resulting acetanilidomethylene and acetanilido allylidene derivatives were finally condensed with the quaternary compounds of few 2-methyl heterocyclic compounds yielding merocarbo and merodicarbo cyanines. Their absorption and photosensitising action were studied.