A2-1, 2, 4-triazolin-5-one, 4. An investigation into the reaction pathway led to the surprising find that when 1 equiv of phosgene was allowed to react with 3, 4-(dimethylamino)-l-methyl- 3-(phenylamino)-5-(phenyl-imino)-A2-1, 2, 4-triao~ ne, 9, was obtained. Pathways for the formation of producta 4 and 9 involved the conversion of 3 into an N-(dimethylamino) carbodiimide, 10. In the formation of 4, the carbodiimide reacted with excess phosgene ...
