carbon monoxide; hydrogen in toluene an autoclave containing a soln. of Ru3-cluster in toluene was pressurized to 500 psig with 1:1 CO-H2 and was heated at 130°C for 23 h; cooled, gases were vented through U-trap (liq. N2), condensate was shown to be Me2O and Ru(CO)5 by mass spectrometry, toluene soln. was filtered (ppt. - Ru3(CO)12 identified by IR data), filtrate evapd., residue chromd. on SiO2 to give addnl. Ru3(CO)12;