What will be the most efficient method for the following synthesis?
Excuse me, I was way too fast with my answer before understanding your question. Apparently this is quite old and well-investigated chemistry from back to the late fifties.
See for example, "Acetylenic Dicobalt Hexacarbonyls. Organometallic Compounds Derived from Alkynes and Dicobalt Octacarbonyl1,2"
Harold Greenfield , Heinz W. Sternberg , Robert A. Friedel , John H. Wotiz , Raymond Markby , Irving Wender
J. Am. Chem. Soc., 1956, 78 (1), pp 120–124.
They reported that your type of reaction proceeds readily at room temperature with the evolvement of 2 equiv. CO. I've seen this also from another references, for example in one where Et2O was used as solvent at room temperature. You can check then with IR :)
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