The Photochemistry of Benzotriazole Derivatives. Part 2: Photolysis of 1-Substituted Benzotriazole Arylhydrazones: New Route to Phenanthridin-6-yl-2-phenyldiazines

摘要

Irradiation of 1-substituted benzotriazole arylhydrazones >3a–c, >4a,>b and >5a,>b with a 16 W low pressure mercury arc-lamp (254 nm) for 24 h gave phenanthridin-6-yl-2-phenyldiazines >9a–c, phenanthridin-6(5H)-ones >10a–c, 1-anilinobenzimidazoles >11a–c, 2-aryl-1H-benzimidazoles >12a–c, 1-arylamino-1H-benzimidazol-2-carboxylic acid ethyl esters >14a,>b, 1-aryl-1H, 9H-benzo [4,5][1,2,3] triazolo[1,2-a]tetrazole-3-carboxylic acid ethyl esters >16a,>b, 1-arylamino-2-benzoylbenzimidazoles >18a,>b and 2-benzoylbenzoxazole >21.