Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 4, Pages 1178-1182Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201813006
Keywords
coordination polymerization; stereoselective polymerization; polyester; recyclable polymer; ring-opening polymerization
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Funding
- United States National Science Foundation [CHE-1664915]
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Construction of robust, stereocomplexed (sc) crystalline material, based on a recently discovered infinitely recyclable polymer system, requires blending of enantiomeric polymer chains produced from respective enantiopure, fused six-five bicyclic lactones. Herein, the stereoselective polymerization of the racemic monomer by yttrium catalysts bearing tetradentate ligands is reported, where the tethered donor sidearm switches the heteroselectivity of the catalyst to isoselectivity when it is changed from the beta-OMe to beta-NMe2 sidearm. The latter catalyst produces an isotactic stereoblock polymer (P-m up to 0.95) that forms the crystalline sc-material with a T-m of up to 171 degrees C. This sc-material can be fully depolymerized back to rac-monomer in a quantitative yield and purity, thus establishing its circular life cycle.
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