Iridium complexes hydrocarbyl

PCP iridium pincer complexes are a well-studied and attractive class of compounds which promote important catalytic and stoichiometric processes. Although this class of compounds are also briefly discussed in the sections describing iridium hydrides (Section 7.04.6) and iridium catalyzed C-C bond-forming processes (Section 7.04.3.5), a few notes addressing their relevance in the chemistry of hydrocarbyl iridium complexes are here necessary. Both the neutral (PCP)Ir [PCP = 3-C6H3-2,6-(CH2PBu )2] and the cationic (PNP)Ir [PNP = 2,6-bis-(di-fet -butyl phosphino... 

Interest in iridium hydrocarbyl complexes has been fueled by the higher thermodynamic stability of both Ir-C and Ir-H bonds in comparison to related compounds of rhodium. Therefore, iridium alkyl and aryl complexes have been frequently and successfully used as kinetically inert models for a variety of rhodium-catalyzed reactions allowing to collect intriguing mechanistic information on important industrial processes and organometallic reactions of academic interest. 

The reactivity of the (vinylidene)iridium(l) complexes /ra ir-[IrCl(C=CR R )(PPr 3)2] toward both Grignard reagents and organolithium compounds has been investigated. The hydrocarbyl vinylidenes /ra 3-[IrR(C=CR R )(PPr 3)2] (R = Me, Ph, C=CPh 562), which straightforwardly form upon treatment with the organolithium reagents, react in the... 

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