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Communication | Regular issue | Vol 6, No. 4, 1977, pp.423-429
Published online, 1st January, 1970
DOI: 10.3987/R-1977-04-0423
Photochemical Reactions of 2-Benzylidenehydrazinopyrimidines

Teruaki Tsujikawa* and Motomi Tatsuta

*Central Research Division, Takeda Chemical Industries, Ltd., 17-85 Jusohonmachi 2-chome, Yodogawa-ku, Osaka 532-8686, Japan


Under a nitrogen atmosphere, anti-isomers of 2-benzylidenehydrazinopyrimidines easily underwent isomerization to their syn-isomers by irradiation with an ultraviolet light over a benzene solution, but in thb presence of oxygen, photosensitized auto-oxidation occurred to afford 3-aryl-1,2,4-triazolo[4,3-a]pyrimidines. When irradiated in the same manner, 2-benzylidenehydrazino-1,3,5-triazine derivative decomposed into benzaldehyde and 2-hydroxy-1,3,5-triazine.