Functionalized Polyesters via Stereoselective Electrochemical Ring-Opening Polymerization of O -Carboxyanhydrides.

Ring-opening polymerization is used to prepare polyesters with precisely controlled molecular weights, molecular weight distributions, and tacticities. Herein, we report a Co/Zn catalytic system that can be activated by an electrical current to mediate efficient ring-opening polymerization of enantiopure O -carboxyanhydrides, allowing for the synthesis of isotactic functionalized polyesters with high molecular weights (>140 kDa) and narrow molecular weight distributions ( M w / M n < 1.1). We also demonstrate that these catalysts can be used for stereoselective ring-opening polymerization of racemic O -carboxyanhydrides to synthesize syndiotactic or stereoblock copolymers with different glass transition temperatures compared with their atactic counterparts.