15,16-Dihydro-11-trifluoromethylcyclopenta[a]phenanthren-17-one 7, an electronegative analogue of the strongly carcinogenic 11-methyl-17-ketone, is synthesised in three steps from 17,17-ethylenedioxy-11,12,13,14,15,16-hexahydrocyclopenta[a]phenanthren-11-one 3.
M. M. Coombs and H. H. Zepik, J. Chem. Soc., Chem. Commun., 1992, 1376 DOI: 10.1039/C39920001376
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