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    Radical anion forming activity of the Grubbs' catalyst and related organometallics: Michael acceptors as metathesis promoters


    Amir-Ebrahimi, Valia and Hamilton, James G. and Nelson, Jane and Rooney, John J. and Rooney, A. Denise and Harding, Charles J. (2000) Radical anion forming activity of the Grubbs' catalyst and related organometallics: Michael acceptors as metathesis promoters. Journal of Organometallic Chemistry, 606 (1). pp. 84-87. ISSN 0022-328X

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    Abstract

    When several p-benzoquinones in methylene chloride solution are mixed at room temperature with RuCl2(PCy3)2(CHPh), RuCl2(PPh3)3, RhCl(PPh3)3 and CoBr2(PPh3)2, strong, well-resolved, persistent epr signals are observed, consistent with the formation of radical anions. In the case of the Grubbs’ catalyst, RuCl2(PCy3)2(CHPh), evidence is presented that these signals arise from charge transfer. The Grubbs’ catalyst, is also remarkable in that similar epr activity is observed using norbornadienes, and to a lesser extent during and after metathesis polymerisation of norbornene and cyclopentene. The dienes are also much more efficient promoters of initiation of these polymerisations than the monoenes, and evidence is presented that the presence of p-benzoquinone enhances the reactivity of the propagating metallacarbenes.

    Item Type: Article
    Keywords: Radical anions; p-Benzoquinones; Dienes and monoenes; Grubbs’ catalyst; Ring-opening metathesis polymerisation; Basic organometallics;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 7985
    Identification Number: https://doi.org/10.1016/S0022-328X(00)00273-4
    Depositing User: Dr. Denise Rooney
    Date Deposited: 01 Mar 2017 16:02
    Journal or Publication Title: Journal of Organometallic Chemistry
    Publisher: Elsevier
    Refereed: Yes
    URI:

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