Abstract Photocyclization of 2-(pentafluoroanilino)-, 2-(4-chloro-2-iodoanilino)-, 2-(2-chloro- 4-iodo-anilino)-4, 6-dimethylpyrimidines, as well as 2-(2-chloro-3-methylanilino) pyridine was used to prepare con-densed azinobenzimidazoles, including previously unknown 8- chloro-1, 3-dimethylpyrimido [1, 2-a] benzimidazole and 9-methylpyrido [1, 2-a] benzimidazole. With isomeric chloroiodoanilinopyrimidines as example it was shown that ...