Ru chloride in methanol heating a soln. of commercial Ru chloride in methanol under a CO pressure of 10 atm at 65 °C for 30 h; formation of solid (Ru3(CO)12) and a pale yellow-green soln.; evapn.; addn. of THF, pptn. of (RuCl2(CO)3(C4H8O));; dissolving in CHCl3, pptn. by addn. of petroleum ether; washing with petroleum ether;;
