Studies on Heterocyclic Compounds. V. Photochemical Reactions of 2-(2,6-Dichlorobenzylidenehydrazino) pyrimidine and Its Related Hydrazones

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Under a nitrogen atmosphere, anti-isomers of 2-benzylidenehydrazinopyrimidines underwent isomerization easily to their syn-isomers by irradiation with ultraviolet light in a benzene solution, but in the 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 derivatives decomposed into benzaldehydes and 2-hydroxy-1,3,5-triazines.
公益社団法人日本薬学会の論文
1977-12-25