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    Variable temperature 1H NMR studies on Grubbs catalysts


    Gallagher, Margaret M. and Rooney, A. Denise and Rooney, John J. (2008) Variable temperature 1H NMR studies on Grubbs catalysts. Journal of Organometallic Chemistry, 693 (7). pp. 1252-1260. ISSN 0022-328X

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    Abstract

    Variable temperature 1H NMR studies were conducted to investigate whether steric congestion is influencing the structural rigidity of (IMesH2)(PCy3)(Cl)2Rudouble bond; length as m-dashCHPh (IMesH2 = 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene) in solution. It was shown that both mesityl ligands rotate at about the same rate around the N-Mesityl bonds in the IMesH2 ligand and that changing the solvent does not significantly alter this rotation. It was found that the increased steric congestion in (IMesH2)(PCy3)(Cl)2Rudouble bond; length as m-dashCHPh compared to (PCy3)2(Cl)2Rudouble bond; length as m-dashCHPh does affect the rates of rotation around the Calkylidene–Ph bonds. Unusual chemical shift positions were also observed in the low temperature 1H NMR spectrum for the aromatic proton signals for (IMesH2)(PCy3)(Cl)2Rudouble bond; length as m-dashCHPh and (PCy3)2(Cl)2Rudouble bond; length as m-dashCHPh.

    Item Type: Article
    Keywords: Grubbs catalysts; Variable temperature NMR; Rotamers;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 7978
    Identification Number: https://doi.org/10.1016/j.jorganchem.2008.01.020
    Depositing User: Dr. Denise Rooney
    Date Deposited: 01 Mar 2017 16:06
    Journal or Publication Title: Journal of Organometallic Chemistry
    Publisher: Elsevier
    Refereed: Yes
    URI:

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