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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...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Beilstein-Institut
2016
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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. |
format | Online Article Text |
id | pubmed-4979879 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Beilstein-Institut |
record_format | MEDLINE/PubMed |
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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