Bifunctional acyl-bis(1,2,4-triazole) functioned as a highly reactive and nontoxic, halogen-free monomer for polyester synthesis that did not require a metal catalyst. Isophthaloyl 1,2,4-triazole was prepared from the corresponding chloride and polymerized with 1,12-dodecanediol at 120 degrees C in the presence of 4-(N,N-dimethylamino)pyridine, resulting in polyester with high molecular weight (M-n = 48.3 x 10(3)) as a colorless solid. The use of solvents such as diphenyl ether was effective to conduct the polymerization of monomers that would not melt at low temperature.