CO in hexane High Pressure; soln. Mn-complex/hexane pressurized to 1100 psi with CO in a Parr high-pressure react. vessel, mixt. stirred (105°C, 16 h); mixt. cooled to room temp., system vented, evapn., TL-chromy. (silica gel, hexane/CH2Cl2 (2/1));