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The reaction of octacarbonyldicobalt and dipropargyl malonateafforded the two expected compounds [CH2(CO2CH2C2H-μ)2][Co2(CO)6]2 1 and [HC2CH2O(O)C～CH2CO2CH2C2H-μ][Co2(CO)6)] 2. Both 1 and 2 were characterized by elemental analysis, IR and NMR. The molecul