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Isoselective Polymerization of rac-Lactide by Highly Active Sequential {ONNN} Magnesium Complexes
- Source :
- Chemistry (Weinheim an der Bergstrasse, Germany). 26(71)
- Publication Year :
- 2020
-
Abstract
- The coordination chemistry and the activities in the ring-opening polymerization catalysis of racemic lactide (LA) of magnesium complexes of a series of {ONNN}-type sequential monoanionic ligands are described. All ligands include pyridyl and substituted-phenolate as peripheral groups. The ligands bearing either chiral or meso-bipyrrolidine cores led to single diastereomeric complexes, whereas the ligands bearing a diaminoethane core led to diastereomer mixtures. All {ONNN}Mg-X complexes [X=Cl, HMDS (hexamethyldisilazide)] led to highly active and isoselective catalysts. The complexes bearing the chiral bipyrrolidine core exhibited the highest activities (full consumption of 5000 equiv. of rac-LA at RT within 5 min) and highest isoselectivities (Pm =0.91), as well as a living character. The complexes of the meso-bipyrrolidine based ligands were almost as active and slightly less stereoselective, while those of the diaminoethane based ligands exhibited reduced activities and isoselectivities.
- Subjects :
- chemistry.chemical_classification
isoselectivity
living polymerization
magnesium
poly(lactic acid)
ring-opening polymerization
Lactide
010405 organic chemistry
Organic Chemistry
Diastereomer
General Chemistry
010402 general chemistry
01 natural sciences
Medicinal chemistry
Ring-opening polymerization
Catalysis
0104 chemical sciences
Coordination complex
chemistry.chemical_compound
chemistry
Polymerization
Living polymerization
Stereoselectivity
Subjects
Details
- ISSN :
- 15213765
- Volume :
- 26
- Issue :
- 71
- Database :
- OpenAIRE
- Journal :
- Chemistry (Weinheim an der Bergstrasse, Germany)
- Accession number :
- edsair.doi.dedup.....b586293d8a17fe698f777ffcd17c28b9