Synthesis of Chiral Sulfur-Containing Polymers: Asymmetric Copolymerization of meso-Epoxides and Carbonyl Sulfide
Release Time:2019-03-12 Hits:
Indexed by: Journal Article
Date of Publication: 2018-09-24
Journal: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Included Journals: SCIE、PubMed
Volume: 57
Issue: 39
Page Number: 12670-12674
ISSN: 1433-7851
Key Words: carbonyl sulfide; desymmetrization; cobalt; polymers; synthetic methods
Abstract: Synthesis of chiral sulfur-containing polymers was realized for the first time by the asymmetric alternating copolymerization of achiral meso-epoxides with carbonyl sulfide (COS) using catalyst systems based on enantiopure binaphthol-linked dinuclear Co-III complexes under mild reaction conditions. The resultant poly(monothiocarbonate)s have main-chain chirality and more than 99% isotacticity. Notably, the stereoregular copolymers are typical semicrystalline thermoplastics with high melting temperatures up to 232 degrees C. Additionally, these sulfur-containing polymers have good optical properties with refractive indices of up to 1.56 and Abbe's numbers of up to 43.
Prev One:Precise Synthesis of Poly(thioester)s with Diverse Structures by Copolymerization of Cyclic Thioanhydrides and Episulfides Mediated by Organic Ammonium Salts
Next One:Tandem Lewis Pair Polymerization and Organocatalytic Ring-Opening Polymerization for Synthesizing Block and Brush Copolymers.