Abstract Ethyl 1, 2, 4-triazole-3-carboxylate (V), its 5-methyl and 5-phenyl derivatives (V and VI, respectively), 3-methyl-1, 2, 4-triazole (VIII), 3-phenyl-1, 2, 4-triazole (IX), 3, 5-dimethy-1, 2, 4-triazole (X), 3, 5-diphenyl-1, 2, 4-triazole (XI) and 3-phenyl-5-methyl-1, 2, 4-triazole (XII) were prepared in 40-70% yields by thermal cyclization of acylamidrazones III.