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Isotactic rac ‐Lactide Polymerization with Copper Complexes: The Influence of Complex Nuclearity
Author(s) -
Fortun Solène,
Daneshmand Pargol,
Schaper Frank
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201505674
Subject(s) - alkoxide , tacticity , methoxide , lactide , polymerization , polymer chemistry , copper , chemistry , polymer , materials science , crystallography , catalysis , organic chemistry
Diiminopyrrolide copper alkoxide complexes, LCuOR (OR 1 = N , N ‐dimethylamino ethoxide, OR 2 =2‐pyridyl methoxide), are active for the polymerization of rac ‐lactide at ambient temperature in benzene to yield polymers with M w / M n =1.0–1.2. X‐ray diffraction studies showed bridged dinuclear complexes in the solid state for both complexes. While LCuOR 1 provided only atactic polylactide, LCuOR 2 produced partially isotactic polylactide ( P m =0.7). The difference in stereocontrol is attributed to a dinuclear active species for LCuOR 2 in contrast to a mononuclear species for LCuOR 1 .