Bifunctional Acyl-1,2,4-triazole: An Alternative Monomer of Dicarbonyl Chloride for Metal- and Halogen-free Polyester Synthesis
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 °C in the presence of 4-(N,N-dimethylamino)pyridine, resulting in polyester with high molecular weight (Mn = 48.3 × 103) 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.