Transition metal complexes of substituted alkynes. IV. Some bridging alkynecobalt complexes

Abstract

Two new organocobalt complexes, Co₂(CO)₄(CF₃C₂CF₃)₃ and Co₂(CO)₄(CF₃C₃H)_2- CF₃C₂CF₃, have been isolated from the appropriate reactions of hexafluorobut-2-yne with octacarbonyldicobalt and of 3,3,3- trifluoropropyne with μ-hexafluorobut-2-yne-hexacarbonyldicobalt. The probable structures of these compounds are discussed in light of their infrared and nuclear magnetic resonance spectra.     The direct formation of complexes of the type Co₃(CO)₉CCH₂R has been established in the reactions of several terminal alkynes, RC₂H (R = H, CF₃, C₆H₅), with octacarbonyldicobalt. The spectroscopic properties of the products so obtained are given.