Poly (1,4-oxyphenylene) (poly(phenylene oxide) (PPO) was synthesized by the enzymatic oxidative polymerization of syringic acid using laccase catalyst in the mixed solvent of a polar organic solvent and the acetate buffer. Oxidative polymerizations usually involve dehydrogenation of monomers, whereas eliminations of carbon dioxide as well as hydrogen from the monomer took place during the present polymerization.