The reaction of octacarbonyldicobalt and dipropargyl malonate

The reaction of octacarbonyldicobalt and dipropargyl malonate afforded the two expected compounds [CH2 (CO2CH2C2H-mu)(2) ] [ Co-2 (CO)(6)](2) 1 and [H C2CH2O (O)C CH2CO2CH2C2H-mu] [ Co-2 (CO)(6)) ] 2, Both 1 and 2 were charact erized by elemental analysis, IR and NMR. The molecular structure of 1 was determined by single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group Pi with the io:rowing crystallographic parame ters: a = 7.7492(15), h = 12.925(3), c = 14.366(3) Angstrom, alpha = 81.92( 3), beta = 77.94(3), gamma = 89.48(3)degrees, V = 1392.9(5) Angstrom (3), Z = 2, M-r = 751.99, D-c = 1.793 g/cm(3), F(000) = 740, mu (Mo-Ka)= 23.13 cm (-1) and final R = 0.0880 for 5421 observations with I >2 sigma (I).