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RESEARCH PRODUCT
Ring-opening polymerization of lactides using heterobimetallic yttrocene complexes
Klaus BeckerleJun OkudaKai C. Hultzschsubject
Polymers and PlasticsChemistryOrganic ChemistrySolution polymerizationCondensed Matter PhysicsRing-opening polymerizationchemistry.chemical_compoundPolymerizationPolymer chemistryMaterials ChemistryProton NMRCopolymerPhysical and Theoretical ChemistryEnantiomerMetalloceneRacemizationdescription
Structurally characterized, chiral heterobimetallic yttrocene derivatives Li[Y(η 5 :η 1 -C 5 R 4 Si-Me 2 NCH 2 CH 2 OMe) 2 ] (R = Me, H) have been shown to be active in the controlled ring-opening polymerization of L-lactide to give poly(L-lactide)s with high molecular weights and moderately narrow molecular weight distributions (M w /M n < 1.50). Both transesterification and racemization appear to be less prominent. 'H NMR spectroscopic tetrad analysis of copolymers prepared using a mixture of L- and D-lactide demonstrates the absence of any preference for one enantiomer during the polymerization.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-07-01 | Macromolecular Chemistry and Physics |