The general synthesis of aryl-(or alkyl-) phosphonate monoesters of selected arenols has been accomplished in good yield by reaction of the substituted phosphonic dichloride with the arenol in pyridine solvent. Careful hydrolysis of the reaction mixture gave the phosphonate monoester which was isolated as the ammonium salt from acetone-ether (1: 2). A comprehensive study of the preparation of 2-naphthyl phenylphosphonate revealed ...