NMR studies of some carbonyl complexes of iridium(I) and (III)

Abstract

The trigonal bipyramidal species [Ir(CO) 3(PEt 3) 2]BF 4 reacts with PH 3 to form [Ir(CO) 2(PH 3)(PEt 3) 2]BF 4. Both of these undergo oxidative addition reactions with HX (XCl, Br, I) with loss of CO, except in the case of XI when the phosphine complex eliminates PH 3 instead. SiH 3Br reacts to give a simple oxidative addition product in each case but when PH 3 is present the solvent and anion both affect the outcome of the reaction. Enrichment with 13C in the carbonyl positions allowed the use of 13C NMR spectroscopy to identify the products.