Abstract
Transmetalation of the structurally characterized silver N-heterocyclic carbene (NHC) salt [Ag(IpFMe)2]+ (1, IpFMe = 1-pentafluorobenzyl-3-methylimidazol-2-ylidene) to [Rh(COD)Cl]2 affords Rh(IpFMe)(COD)Cl (2). The analogous neutral iridium complex, Ir(IpFMe)(COD)Br (5), may be formed upon elimination of MeOH from [Ir(COD)(OMe)]2 in the reaction with 1-pentafluorobenzyl-3-methylimidazolium bromide. Thermolysis of [Ag(IpFMe)2]+ with either 5 or [Ir(COD)Cl]2 yields the cationic bis-NHC complex [Ir(IpFMe)2(COD)](AgX2) (6, X = Cl, Br), which exists as a mixture of conformers in solution. Addition of CO or AgOTf to 2 gives Rh(IpFMe)(CO)2Cl (3) and Rh(IpFMe)(COD)(OTf) (4), respectively. The molecular structures of compounds 1−6 have been determined by X-ray crystallography.
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