The chemistry of carbonyl(phenylethynyl)bis(triphenylphosphine)iridium(I)

Abstract

The title complex has been prepared by a slightly modified route via its carbonyl adduct, and the formation of an intermediate species ‘[lr(HC₂Ph)(CO)₂(PPh₃)₂]+’ is suggested. The complex [lr(C₂Ph)(CO)(PPh₃)₂] readily under-goes addition reactions in solution with a wide variety of reagents; in some cases attack is observed only at the metal atom [SO₂, HgCl₂,H₂, O₂, CF₃CO₂H, MeCO₂H, C₂(CO₂Me)₂, Mel, or C₂(CN)₄] and in others both at the metal and at the acetylene linkage (HCl, HBr, Hl, Cl₂, Br₂, or I₂).