C2H5OH; HCl in further solvent(s) under N2, suspn. of Ru complex in Et3Al stirred for 2 h at 75°C; upper colorless layer removed by washing with petroleum ether, residue treated with ethanol, soln. evapd. to dryness, added HCl at -78°C, product extd. into CH2Cl2, evapd., recrystd. from CH2Cl2/ethanol mixt.;