Influence of a [Me2Si] ansa bridge on the barrier to rotation about the Zr–phenyl bond and on the generation and reactivity of benzyne intermediates: comparison of the structures and reactivity of [Me2Si(C5Me4)2]Zr(Ph)X and Cp*2Zr(Ph)X (X = H, Cl, Ph)
- 20 November 2000
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 24,p. 4490-4493
- https://doi.org/10.1039/b005117i
Abstract
Comparison of the chemistry of [Me2Si(C5Me4)2]ZrPh2 and Cp*2ZrPh2 demonstrates that incorporation of a [Me2Si] ansa bridge reduces the barrier for both (i) rotation about the Zr–Ph bond and (ii) elimination of benzene to generate a benzyne intermediate; furthermore, the [Me2Si] ansa bridge promotes the reaction of two equivalents of MeCN with the benzyne intermediate {[Me2Si(C5Me4)2]Zr(η2-C6H4)}, whereas insertion of only one equivalent is observed with [Cp*2Zr(η2-C6H4)].Keywords
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