Synthesis of Polyamides by Direct Polycondensation with 5-Methyl-2-chloro-3-phenyl-2,3-dihydro-1,3,4,2-oxadiazaphosphole as a New Condensing Agent

Abstract

A new condensing agent, 5-methyl-2-chloro-3-phenyl-2,3-dihydro-1,3,4,2-oxadiazaphosphole (2) prepared from β-N-acetyl-phenylhydrazine (1) and phosphorus trichloride was used for the synthesis of amides and polyamides. The condensing agent was useful for the preparation of amides from carboxylic acids and amines. The direct polycondensation of dicarboxylic acids with aromatic diamines using the condensing agent in the presence of pyridine proceeded at room temperature to produce polyamides with inherent viscosities up to 1.9 dl g−1.