title: Asymmetric Alternating Copolymerization of Meso-epoxides and Cyclic Anhydrides: Efficient Access to Enantiopure Polyesters.
abstract: Synthesis of stereoregular polyesters with main-chain chirality was achieved for the first time by the asymmetric copolymerization of meso-epoxides and cyclic anhydrides using catalyst systems based on enantiopure bimetallic complexes. The combination of the biphenol-linked dinuclear aluminum complex with tert-butyl groups in the phenolate ortho-positions and a nucleophilic co-catalyst was found to be more efficient in catalyzing this asymmetric copolymerization, affording enantiomerically enriched polyesters (up to 91% ee) with completely alternating structure and narrow molecular weight distribution. It was discovered that the isotactic-enriched poly(cyclopentene phthalate) is a typical semicrystalline material with a melting endothermic peak at 221 °C. This study is expected to provide a promising route to prepare various stereoregular polyesters having a wide variety of physical properties and degradability.
authors: State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China.
authors: Jie
authors: J
authors: Li
authors: State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China.
authors: Ye
authors: Y
authors: Liu
authors: State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China.
authors: Wei-Min
authors: WM
authors: Ren
authors: State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China.
authors: Xiao-Bing
authors: XB
authors: Lu