Isotactic rac‐Lactide Polymerization with Copper Complexes: The Influence of Complex Nuclearity |
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| Authors: | Solène Fortun Pargol Daneshmand Prof. Dr. Frank Schaper |
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| Affiliation: | Centre in Green Chemistry and Catalysis, University of Montreal, Department of Chemistry, C. P. 6128 Succ. Centre‐Ville, Montréal, QC, H3C 3J7 (Canada) |
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| Abstract: | Diiminopyrrolide copper alkoxide complexes, LCuOR (OR1=N,N‐dimethylamino ethoxide, OR2=2‐pyridyl methoxide), are active for the polymerization of rac‐lactide at ambient temperature in benzene to yield polymers with Mw/Mn=1.0–1.2. X‐ray diffraction studies showed bridged dinuclear complexes in the solid state for both complexes. While LCuOR1 provided only atactic polylactide, LCuOR2 produced partially isotactic polylactide (Pm=0.7). The difference in stereocontrol is attributed to a dinuclear active species for LCuOR2 in contrast to a mononuclear species for LCuOR1. |
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| Keywords: | copper homogeneous catalysis lactide N ligands ring‐opening polymerization |
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