hydroquinone in ethanol; water was prepared by modification of method described in (Benzman et al. Inorg. Chem. 19 (1980) 3755). heating of H2IrCl6*xH2O and hydroquinone in EtOH-water (2:1) at reflux for 1 h under N2, addn. of C8H12, reflux for 4 h; concn., addn. of water, cooling to room temp., filtration, washing with cold CH3OH, drying in vac. over P2O5;

in water; isopropyl alcohol (Ar), Ir salt dissolved in propane-2-ol/water 3/1, treated with excess of ligand, stirred for 5 min, refluxed with vigorous stirring for 3 h; cooled to room temp., concd., washed (cold methanol), dried (vac.);

hydrogen in benzene T=22°C; P=2068.65 Torr;

in dichloromethane

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;