Ru‐Based Olefin Metathesis Catalysts Bearing pH‐Responsive N‐Heterocyclic Carbene (NHC) Ligands: Activity Control via Degree of Protonation
1
Department of Chemistry & Biochemistry, The University of Southern Mississippi, 118 College Drive, Hattiesburg, MS 39406‐5043, USA
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2
School of Polymers and High Performance Materials, The University of Southern Mississippi, 118 College Drive, Hattiesburg, MS 39406‐10076, USA
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Тип публикации: Journal Article
Дата публикации: 2009-04-15
scimago Q2
wos Q3
БС2
SJR: 0.459
CiteScore: 3.9
Impact factor: 2.0
ISSN: 14341948, 10990682
Inorganic Chemistry
Краткое описание
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-dihydroimidazol-2-ylidene] were used for the ring-opening metathesis polymerization (ROMP) of exo-7-oxanorbornene derivative 7 in the presence of various amounts of acid. Upon gradual protonation of the NMe2 groups of the H2Tap ligand, the metathesis activity of both catalysts were gradually reduced due to electronic changes of the N-heterocyclic carbene (NHC) ligand donor capability. The investigation of the ROMP polymer 8, DFT calculations and measurements of the initiation kinetics prove that the reduced activity is solely due to reduced rates of propagation.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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Balof S. L. et al. Ru‐Based Olefin Metathesis Catalysts Bearing pH‐Responsive N‐Heterocyclic Carbene (NHC) Ligands: Activity Control via Degree of Protonation // European Journal of Inorganic Chemistry. 2009. Vol. 2009. No. 13. pp. 1717-1722.
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Balof S. L., Yu B., Lowe A. B., Yan L., Zhang Y., Schanz H. Ru‐Based Olefin Metathesis Catalysts Bearing pH‐Responsive N‐Heterocyclic Carbene (NHC) Ligands: Activity Control via Degree of Protonation // European Journal of Inorganic Chemistry. 2009. Vol. 2009. No. 13. pp. 1717-1722.
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TY - JOUR
DO - 10.1002/ejic.200801145
UR - https://doi.org/10.1002/ejic.200801145
TI - Ru‐Based Olefin Metathesis Catalysts Bearing pH‐Responsive N‐Heterocyclic Carbene (NHC) Ligands: Activity Control via Degree of Protonation
T2 - European Journal of Inorganic Chemistry
AU - Balof, Shawna L
AU - Yu, Bing
AU - Lowe, Andrew B
AU - Yan, Ling
AU - Zhang, Yong
AU - Schanz, Hans-Jörg
PY - 2009
DA - 2009/04/15
PB - Wiley
SP - 1717-1722
IS - 13
VL - 2009
SN - 1434-1948
SN - 1099-0682
ER -
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@article{2009_Balof,
author = {Shawna L Balof and Bing Yu and Andrew B Lowe and Ling Yan and Yong Zhang and Hans-Jörg Schanz},
title = {Ru‐Based Olefin Metathesis Catalysts Bearing pH‐Responsive N‐Heterocyclic Carbene (NHC) Ligands: Activity Control via Degree of Protonation},
journal = {European Journal of Inorganic Chemistry},
year = {2009},
volume = {2009},
publisher = {Wiley},
month = {apr},
url = {https://doi.org/10.1002/ejic.200801145},
number = {13},
pages = {1717--1722},
doi = {10.1002/ejic.200801145}
}
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Balof, Shawna L., et al. “Ru‐Based Olefin Metathesis Catalysts Bearing pH‐Responsive N‐Heterocyclic Carbene (NHC) Ligands: Activity Control via Degree of Protonation.” European Journal of Inorganic Chemistry, vol. 2009, no. 13, Apr. 2009, pp. 1717-1722. https://doi.org/10.1002/ejic.200801145.