The 4-RN-1,3-Ar-imidazolium salt, R = iPr, Bu, Ar = Mes, Dipp, Mes = mesityl, Dipp = 2,6-bis-diisopropyl-phenyl was metalated by Au at the C2-, C5- and 4-RN positions depending on the reactants and conditions employed; a rare direct rearrangement of a Au aminide to an abnormal imidazol-5-ylidene Au complex was also observed and based on a DFT study it may involve TfO facilitated H transfer.
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