A dicobalt hexacarbonyl(alkyne) moiety is used as a stereocontrol element in Friedel–Crafts cycloalkylation reactions that deliver cis-4a-ethynyl-1,2,3,4,4a,9,10,10a-octahydrophenanthrenes exclusively.
D. D. Grove, J. R. Corte, R. P. Spencer, M. E. Pauly and N. P. Rath, J. Chem. Soc., Chem. Commun., 1994, 49 DOI: 10.1039/C39940000049
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