potassium hydroxide in diethyl ether; water (IrCl(COD))2 and acetylacetone sombined under N2 in degassed Et2O and aq. KOH added, soln. stirred for 30 min; water added, ether removed in vacuo, product filtered in air, washed with 2-propanol, pentane and Et2O and dried in vacuo; identified by IR and1H NMR spectra;