αω-Diynes may be efficiently cocyclised with 1,3-bis(trimethylsilyl)propyne and several substituted trimethylsilylalkynes in the presence of CpCo(CO)2 catalyst to give annelated benzenes amenable to further functionalization.
E. R. F. Gesing, J. A. Sinclair and K. P. C. Vollhardt, J. Chem. Soc., Chem. Commun., 1980, 286 DOI: 10.1039/C39800000286
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