Bennett prepared the analogue from the 1,5-cyclooctadiene (1,5-cod) iridium(I) dimer, , using an excess of triphenylphosphine in ligroin under reflux. The product is isomorphous with Wilkinson's catalyst but does not lose a triphenylphosphine ligand through dissociation in organic solvents anywhere near as readily. A phosphine is lost under oxidative conditions with chlorine, affording initially and with excess chlorine, the iridium(IV) complex [IrCl4(PPh3)2 is obtained. rearranges on heating via an insertion reaction, an "ortho"-metalation of one of the phenyl moieties, to produce the six-co-ordinate organometallic iridium(III) hydride [HIrCl(PPh3)2(Ph2PC6H4) – an example of iridium(I)-iridium(III) tautomerism involving the formation of a bidentate phosphine ligand with a carbon donor atom: