Ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (NHC) ligands: Activity control via degree of protonation
Olefin metathesis catalysts (H2ITap)(PCy3)Cl2Ru=CHPh (4)and (H2ITap)Cl2Ru=CH-(C6H4-O-iPr) (5)[H2ITap = 1,3-bis-(2-,6-dimethyl-4- dimethylaminophenyl)-4,5-dihydroimid-azol-2-ylidene] were used for the ring-opening metathesispolymerization (ROMP) of exo-7-oxanorbornene derivative 7in the presence of v...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
Wiley - V C H Verlag GmbH
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/5682 |
| _version_ | 1848744864996392960 |
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| author | Balof, S. Yu, B. Lowe, Andrew Ling, Y. Zhang, Y. Schanz, H. |
| author_facet | Balof, S. Yu, B. Lowe, Andrew Ling, Y. Zhang, Y. Schanz, H. |
| author_sort | Balof, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Olefin metathesis catalysts (H2ITap)(PCy3)Cl2Ru=CHPh (4)and (H2ITap)Cl2Ru=CH-(C6H4-O-iPr) (5)[H2ITap = 1,3-bis-(2-,6-dimethyl-4- dimethylaminophenyl)-4,5-dihydroimid-azol-2-ylidene] were used for the ring-opening metathesispolymerization (ROMP) of exo-7-oxanorbornene derivative 7in the presence of various amounts of acid. Upon gradualprotonation of the NMe2 groups of the H2Tap ligand, the me-tathesis activity of both catalysts were gradually reduced dueto electronic changes of the N-heterocyclic carbene (NHC)ligand donor capability. The investigation of the ROMP poly-mer 8, DFT calculations and measurements of the initiationkinetics prove that the reduced activity is solely due to re-duced rates of propagation. © Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009. |
| first_indexed | 2025-11-14T06:08:15Z |
| format | Journal Article |
| id | curtin-20.500.11937-5682 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:08:15Z |
| publishDate | 2009 |
| publisher | Wiley - V C H Verlag GmbH |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-56822017-09-13T14:46:24Z Ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (NHC) ligands: Activity control via degree of protonation Balof, S. Yu, B. Lowe, Andrew Ling, Y. Zhang, Y. Schanz, H. Olefin metathesis catalysts (H2ITap)(PCy3)Cl2Ru=CHPh (4)and (H2ITap)Cl2Ru=CH-(C6H4-O-iPr) (5)[H2ITap = 1,3-bis-(2-,6-dimethyl-4- dimethylaminophenyl)-4,5-dihydroimid-azol-2-ylidene] were used for the ring-opening metathesispolymerization (ROMP) of exo-7-oxanorbornene derivative 7in the presence of various amounts of acid. Upon gradualprotonation of the NMe2 groups of the H2Tap ligand, the me-tathesis activity of both catalysts were gradually reduced dueto electronic changes of the N-heterocyclic carbene (NHC)ligand donor capability. The investigation of the ROMP poly-mer 8, DFT calculations and measurements of the initiationkinetics prove that the reduced activity is solely due to re-duced rates of propagation. © Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009. 2009 Journal Article http://hdl.handle.net/20.500.11937/5682 10.1002/ejic.200801145 Wiley - V C H Verlag GmbH restricted |
| spellingShingle | Balof, S. Yu, B. Lowe, Andrew Ling, Y. Zhang, Y. Schanz, H. Ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (NHC) ligands: Activity control via degree of protonation |
| title | Ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (NHC) ligands: Activity control via degree of protonation |
| title_full | Ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (NHC) ligands: Activity control via degree of protonation |
| title_fullStr | Ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (NHC) ligands: Activity control via degree of protonation |
| title_full_unstemmed | Ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (NHC) ligands: Activity control via degree of protonation |
| title_short | Ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (NHC) ligands: Activity control via degree of protonation |
| title_sort | ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (nhc) ligands: activity control via degree of protonation |
| url | http://hdl.handle.net/20.500.11937/5682 |