Highly ylidic imidazoline-based fulvenes as suitable precursors for the synthesis of imidazolium-substituted metallocenes.

[摘要]：Imidazoline-derived fulvenes prepd. from CpLi and an ethoxytetramethylimidazolium tetrafluoroborate show the highest known ylidic character for 6,6-diaminofulvenes. This is displayed in the extraordinary long exocyclic double bond of 1.430 ? Therefore these fulvenes exhibit cyclopentadienyl anion-like reactivity, namely, protonation to cyclopentadienes and reaction with Fe(II) chloride to give Cp-substituted 2-imidazolium ferrocenes and with [Cp*Ru(MeCN)3]OTf to give ruthenocene complex.

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