in toluene (Ar/N2) Mo complex in toluene was stirred with (Fe2(CO)9) at 85°Cfor 12 h; solvent was removed in vacuo, residue was extd. in hexane, passed hroughCelite, concd. and kept at -40°C, soln. was filtered, concd. and chromed. on silica TLC (hexane-CH2Cl2 9:1); elem. anal.;