in dichloromethane CO-atmosphere; bubbling CO through Ir-complex soln. at room temp.;

in acetonitrile CO-atmosphere; stirring Ir-complex with equimolar amt. of Ag-salt for 15min, filtration (Celite), saturation with CO; addn. of Et2O, then addn. of hexane (pptn.), filtration, washing (hexane), drying (vac.); elem. anal.;