4‐Phenyl‐1,2,4‐Triazoline‐3,5‐Dione

Abstract 4‐Phenyl‐1,2,4‐triazoline‐3,5‐dione intermediate: 52 g. (0.50 mole) of ethyl hydrazinecarboxylate in 550 ml. of dry benzene intermediate: 4‐phenyl‐1‐carbethoxysemicarbazide intermediate: 4‐phenylurazole product: 4‐(4‐nitrophenyl)urazole product: 4‐ tert ‐butylurazole product: 4‐Benzalaminourazole product: 4‐benzalamino‐1,2,4‐triazoline‐3,5‐dione product: 4‐Phenyl‐1,2,4‐triazoline‐3,5‐dione