Studies on heterocyclic compounds. V. Photochemical reactions of 2-(2,6-dichlorobenzylidenehydrazino)pyrimidine and its related hydrazones.
作者:TERUAKI TSUJIKAWA、MOTOMI TATSUTA
DOI:10.1248/cpb.25.3137
日期:——
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.
在氮气环境下,用紫外线照射苯溶液中的 2-亚苄基肼基嘧啶的反异构体,很容易将其异构化为同分异构体,但在氧气存在的情况下,会发生光敏自氧化反应,生成 3-芳基-1,2,4-三唑并[4,3-a]嘧啶。用同样的方法照射时,2-亚苄基肼基-1,3,5-三嗪衍生物会分解成苯甲醛和 2-羟基-1,3,5-三嗪。