ArticleAngewandte Chemie (International ed. in English)2026
Rapid and Stereoselective Ring-Opening Polymerization of rac-Lactide Enabled by a Chiral Cyclopropenimine-Thiourea Catalyst.
Article in Angewandte Chemie (International ed. in English), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Polylactide (PLA) is an important bioplastic derived from renewable resources, valued for its biocompatibility and biodegradability. The tacticity and microstructure of PLA significantly influence its thermomechanical properties, yet achieving both high reactivity and precise stereocontrol in the organocatalytic ring-opening polymerization of rac-lactide remains a major challenge. Herein, we show that chiral cyclopropenimine-thiourea organocatalysts enable a rapid and highly stereoselective polymerization of rac-lactide to produce isotactic stereoblock PLAs. This strategy supports fast propagation and living behavior, yielding PLAs with controlled molecular weights and narrow dispersities. Notably, our bifunctional organocatalyst exhibits a remarkably high turnover frequency of up to 1,710 h
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