Iridium-TPPMS complex

Hydrosoluble iridium alkyl complexes may also be prepared by hydrolysis of alkynes and alkenes promoted by water-soluble precursors. The reaction with alkynes follows the well-known mechanism demonstrated by Bianchini et al. for ruthenium complexes.A reasonable mechanism, related to that of hydrolytic breakage, has been proposed by Chin etal. to account for the hydrolysis of ethene promoted by [Cp"lr(TPPMS)Cl2] 344 in the presence of silver salts in water. Scheme 37 describes the Chin s hydrolysis of alkynes, leading to [Cp Ir(TPPMS)(CO)(CH2R)] (69 R=Ph, Bz, Bu, />-Tol) via the aquo complex [Cp Ir(TPPMS)(OH2)OTf 345... 

Water-soluble iridium hydrides containing PTA, TPPMS, and TPPTS ligands have been described and a few notes on these compounds have been presented in Section 1.1 of this review." A remarkable hydrosoluble hydride is [Cp Ir(bpy)H] 821 prepared by Ogo and co-workers by controlled protonation of the aquo complex [Cp Ir (bpy)(H20)] 505 with carboxylic acids. ° Compound 821 has been used as a robust and highly active catalyst... 

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