Anionic N-Heterocyclic Carbene Ligands from Mesoionic Imidazolium Precursors: Remote Backbone Arylimino Substitution Directs Carbene Coordination

[摘要]：Versatile precursor to metal complexes: The lithiated N-heterocyclic carbene derivative [Li(imino-imidide)(tmeda)] (imino-imidide=4-(2,6-diisopropylphenylimino)imidazol-2-ylidenide), obtained by deprotonation and lithiation of a mesoionic 4-aryliminoimidazolium, serves as a versatile precursor to metal complexes with the anionic 4-aryliminoimidazolide by salt metathesis. DFT calculations demonstrate that tuneable electronic and steric factors of the substituent at the N-exo imino function of the heterocycle dictate the preferred site of the metallation (C-NHC vs. N-exo).

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