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Angew Chem Int Ed Engl. 2019 Sep 2;58(36):12585-12589. doi: 10.1002/anie.201903224. Epub 2019 Apr 12.

Polymerization of rac-Lactide Using Achiral Iron Complexes: Access to Thermally Stable Stereocomplexes.

Author information

1
Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris, 75005, Paris, France.
2
Univ. Lille, CNRS, UMR 8576-Unité de Glycobiologie Structurale et Fonctionnelle, 59000, Lille, France.
3
Sorbonne Université, CNRS, IPCM-UMR 8232, B.C. 229, 4 place Jussieu, 75252, Paris Cedex 05, France.
4
Institut de Chimie des Substances Naturelles, CNRS UPR2301, Université Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, 91198, Gif-sur-Yvette Cedex, France.
5
Université de Toulouse, INSA, UPS; LPCNO (IRSAMC), 135 avenue de Rangueil, 31077, Toulouse, France.
6
CNRS, UMR 5215 (IRSAMC), 31077, Toulouse, France.
7
Department of Chemistry and Biology A. Zambelli, INSTM Research Unit, University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, SA, Italy.

Abstract

Enantiopure poly(lactic acid) (PLA) can form stereocomplexes when enantiomeric PLA chains are mixed in equivalent amounts. Such materials provide interesting features that might be suitable for numerous applications. Despite several advantages, the main drawback of PLA is its narrow window of processing, thus limiting its use for industrial applications. Reported herein are achiral iron complexes, that are highly active, productive, and stereoselective under mild reaction conditions for the ring-opening polymerization of lactide. The corresponding catalytic systems enable the production of stereoblock polymers with high molecular weights, allowing the formation of thermally stable and industrially relevant stereocomplexes.

KEYWORDS:

homogeneous catalysis; iron complexes; lactide; polymers; synthetic methods

PMID:
30908800
DOI:
10.1002/anie.201903224

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