The Bu2BOTf mediated reaction of stannylsilanes (5 and 9) with γ-methoxy-alkynoate and -alkynone hexacarbonyldicobalt complexes (8), followed by conversion of the organic carbonyl into an acetate and a BF3·OEt2 mediated intramolecular reaction, affords cycloheptenyne hexacarbonyldicobalt complexes (13 and 15).
J. R. Green, Chem. Commun., 1998, 1751 DOI: 10.1039/A803316A
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