Bi-functional and mono-component organocatalysts for the ring-opening alternating co-polymerisation of anhydride and epoxide

Abstract

The polyester synthesis from anhydrides and epoxides requires their strictly alternating incorporation achieved by a catalyst that is capable of mediating the reactivity of carboxylate and alcohol chain ends.

Highly Selective O-Phenylene Bisurea Catalysts for ROP: Stabilization of Oxyanion Transition State by a Semiflexible Hydrogen Bond Pocket

“…Advances in organocatalytic ring-opening polymerization (ROP) have provided new potent, metal-free strategies for synthesizing a wide range of polymers, including polyesters, polycarbonates, polysiloxanes, polyacrylates, and polyolefins. − ,− Early generations of organocatalysts for ring-opening polymerization (ROP) were capable of catalyzing chain growth at high rates, but the high basicity and nucleophilicity of some of these early active catalysts were often accompanied by unwanted side reactions such as competitive initiation, monomer enolization, epimerization, and chain-transfer reactions. ,,,− …”