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Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions

A series of Cr(III) complexes based on quinoline-cyclopentadienyl ligands with additional hemilabile side arms were prepared and used as single-site catalyst precursors for ethylene polymerization. The additional donor functions interact with the metal centers only after activation with the co-catal...

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Detalles Bibliográficos
Autores principales: Mark, Stefan, Wadepohl, Hubert, Enders, Markus
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4979879/
https://www.ncbi.nlm.nih.gov/pubmed/27559387
http://dx.doi.org/10.3762/bjoc.12.131
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author Mark, Stefan
Wadepohl, Hubert
Enders, Markus
author_facet Mark, Stefan
Wadepohl, Hubert
Enders, Markus
author_sort Mark, Stefan
collection PubMed
description A series of Cr(III) complexes based on quinoline-cyclopentadienyl ligands with additional hemilabile side arms were prepared and used as single-site catalyst precursors for ethylene polymerization. The additional donor functions interact with the metal centers only after activation with the co-catalyst. Evidence for this comes from DFT-calculations and from the differing behavior of the complexes in ethylene polymerization. All complexes investigated show very high catalytic activity and the additional side arm minimizes chain-transfer reactions, leading to increase of molecular weights of the resulting polymers.
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spelling pubmed-49798792016-08-24 Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions Mark, Stefan Wadepohl, Hubert Enders, Markus Beilstein J Org Chem Full Research Paper A series of Cr(III) complexes based on quinoline-cyclopentadienyl ligands with additional hemilabile side arms were prepared and used as single-site catalyst precursors for ethylene polymerization. The additional donor functions interact with the metal centers only after activation with the co-catalyst. Evidence for this comes from DFT-calculations and from the differing behavior of the complexes in ethylene polymerization. All complexes investigated show very high catalytic activity and the additional side arm minimizes chain-transfer reactions, leading to increase of molecular weights of the resulting polymers. Beilstein-Institut 2016-07-04 /pmc/articles/PMC4979879/ /pubmed/27559387 http://dx.doi.org/10.3762/bjoc.12.131 Text en Copyright © 2016, Mark et al. https://creativecommons.org/licenses/by/2.0https://www.beilstein-journals.org/bjoc/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Organic Chemistry terms and conditions: (https://www.beilstein-journals.org/bjoc/terms)
spellingShingle Full Research Paper
Mark, Stefan
Wadepohl, Hubert
Enders, Markus
Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions
title Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions
title_full Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions
title_fullStr Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions
title_full_unstemmed Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions
title_short Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions
title_sort molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions
topic Full Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4979879/
https://www.ncbi.nlm.nih.gov/pubmed/27559387
http://dx.doi.org/10.3762/bjoc.12.131
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