Fulvene versus zwitterion: Imidazoline-derived fulvenes prepared from CpLi and an uronium salt show the highest known ylidic character for 6,6-diaminofulvenes. This is displayed in the extraordinary long exocyclic double bond of 1.430 Å. Therefore these fulvenes exhibit cyclopentadienylanion-like reactivity, namely, protonation to cyclopentadienes and reaction with iron(II) chloride to give Cp-substituted 2-imidazolium ferrocenes.
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Kunz et al. (2008) studied this question.
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