Abstract
Treatment of N-methylimidazole with pentafluorobenzyl bromide produces 1-pentafluorobenzyl-3-methylimidazolium bromide ( 1), which reacts with silver(I) oxide to give the N-heterocycle carbene (NHC) complex 1-pentafluorobenzyl-3-methylimidazolin-2-ylidene silver(I) bromide ( 2). Complex 2 acts as a carbene transfer reagent giving the complexes [(η 5-C 5Me 5)MCl 2(NHC)] ( 3a, M = Rh; 3b M = Ir) on reaction with [(η 5-C 5Me 5)MCl(μ-Cl)] 2. An attempt to use intramolecular dehydrofluorinative coupling methodology to link the carbene and the pentamethylcyclopentadienyl ligands of [(η 5-C 5Me 5)RhCl(CN t Bu)(NHC)]BF 4 was unsuccessful.
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