Iridium complexes, as catalysts for

Pentamethylcyclopentadienyl-Rhodium and -Iridium Complexes as Catalysts for Olefin and Arene Hydrogenation... 

Ebrahimi, D., Kennedy, D. F., Messerle, B. A. Hibbert, D. B. (2008). High throughput screening arrays of rhodium and iridium complexes as catalysts for intramolecular hydroamination using parallel factor analysis. Analyst, Vol. 133,... 

The efficiency of a series of rhodium and iridium complexes as catalysts for the cyclization of terminal and nonterminal alkynes to give 0,0-acetals and spiroketals was tested using [Ir(PyP)(CO)2]BPh4 and [Rh(bim)(CO)2]BPh4 (bim = bis (N-methylimidazol-2-yl)-methane [32-34]. The iridium complex was more efficient than rhodium in promoting the reactions of aliphatic alkyne diols. The rhodium was more effective for promoting the reactions of aromatic substrates (Scheme 15). 

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