in dichloromethane Addn. of 2 equivs. of (PPh4)(Mn(CO)5)-soln. to Fe3(CO)9(CCH2C(O)OCH3) in CH2Cl2 under N2 at room temp., stirring (5 h).; Evapn. to dryness, extn. of residue with hexane to remove Mn2(CO)10, dissolving in min. amt. of methanol, cooling to -20°C, fractional crystn. yields the allenyl complex, elem. anal..;