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    Ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (NHC) ligands: Activity control via degree of protonation

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    Authors
    Balof, S.
    Yu, B.
    Lowe, Andrew
    Ling, Y.
    Zhang, Y.
    Schanz, H.
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Balof, S. and Yu, B. and Lowe, A. and Ling, Y. and Zhang, Y. and Schanz, H. 2009. Ru-based olefin metathesis catalysts bearing ph-responsive n-heterocyclic carbene (NHC) ligands: Activity control via degree of protonation. European Journal of Inorganic Chemistry (13 SPEC. ISS.): pp. 1717-1722.
    Source Title
    European Journal of Inorganic Chemistry
    DOI
    10.1002/ejic.200801145
    ISSN
    1434-1948
    School
    Nanochemistry Research Institute
    URI
    http://hdl.handle.net/20.500.11937/5682
    Collection
    • Curtin Research Publications
    Abstract

    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.

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