in toluene synthesis under N2 and with dry, freshly distd. solvents; solving W complex in toluene, suspending Fe2(CO)9 in soln., stirring for 6 h at 50°C, filtration over silica gel, removal of solvent in vac.;; solving in n-pentane, chromy. on SiO2 gel column at -25°C with n-pentane/toluene (20/1) gave Fe3(CO)12 and (8/1-5/1) C19Fe3O19P2W2, toluene/CH2Cl2 (10/1) C13HFe2O13PW; removal of solvent, recrystn., analytically pure C19Fe3O19P2W2; elem. anal.;;

in tetrahydrofuran under dry N2, Schlenk setup, soln. of KCo(CO)4 (6 mmol) added dropwise to soln. of W complex (2 mmol) at -78°C, stirred for 30 min, warmed to room temp., stirred for 14 h, evapd.; sublimated at 50°C in vac. to remove W(CO)6, chromd. (silica, hexane, hexane/toluene), elem. anal.;