Iridium (III) dimethyl complexes supported by NHC ligands and a cyclopentadienyl moiety (cyclopentadiene, tetramethylcyclopentadiene, and pentamethylcyclopentadiene) have been prepared.  These complexes are utilized to generate electrophilic cationic Ir(III) complexes possessing an open site anticipated to be reactive towards C-H bonds.  These complexes also serve as starting materials to form cationic Ir(III) carbonyl complexes.  These carbonyl complexes exhibit CO stretching frequencies similar to those observed for the related [CpMe5(PMe3)Ir(Me)(CO)]+.  This data indicates that the NHC ligands have donor abilities similar to phosphines, and the the Ir(III) complexes are electronically poised for C-H bond activation.

C-H bond activation by iridium (III) complexes supported by NHC and cyclopentadienyl ligands

246th National Meeting (2013)

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