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)

Hyosun Lee, Brian M. Bridgewater, Gerard Parkin

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Abstract

Comparison of the chemistry of [Me2Si(C5Me4)2]ZrPh2 and Cp2ZrPh2 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(η 2-C6H4)}, whereas insertion of only one equivalent is observed with [Cp*2Zr(η2-C6H4)].

Original languageEnglish
Pages (from-to)4490-4493
Number of pages4
JournalJournal of the Chemical Society. Dalton Transactions
Issue number24
DOIs
StatePublished - 2000

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