Organobase-catalyzed carboxyl-yne click polymerization

Unsaturated polyester can be directly chemically modified, which provides sufficient feasibility for further functionalization of polymeric polyester, so the simple synthesis of unsaturated polyester is of great significance. We have developed click polymerization of diynes and dicarboxylic acids with DABCO as catalyst. After the optimization of reaction conditions, the poly (carbonyl enol ester) with molecular weight of 24 200 was obtained, and the polymerization yield reached 96%. The synthesis of fat and aromatic poly (carbonyl enol ester) could be realized in different solvents. The polymerization reaction has excellent regioselectivity and stereoselectivity, and the obtained aliphatic unsaturated polycarbonyl enol esters are crystalline polymers. In addition, the polymerization reaction needs mild conditions, short reaction time, can be carried out in air atmosphere, and has low requirements on the purity and types of reaction reagents, and can realize gram-level polymer preparation, thus providing a convenient, efficient and rapid synthetic route for the preparation of enol ester materials.