Ring-opening copolymerization of CHO and MA catalyzed by the asymmetrical Cr(III)-bis-Schiff-base complex

An asymmetrical Cr(III)-bis-Schiff-base complex [Cr(L)Cl] (1) in combination with DMAP is found to effectively catalyze bulk solvent-free copolymerization of CHO and MA, and their low concentrations can produce the perfectly alternating polyester in a controllable mode.68