Anionic N-heterocyclic carbenes (NHCs) bear an exo- or endo-cyclic anionic substituent.
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Anionic NHCs containing delocalized or non-delocalized anionic charges are described.
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Anionic NHCs react with transition-metal or main-group precursors to afford overall neutral zwitterionic complexes or ate-complexes.
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Comparison of the catalytic performance of these overall neutral zwitterionic and their cationic congeners is described.
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