Treatment of pregnane-3,20-diones (1) by HF–SbF5 or HSO3F–SbF5 leads to a mixture of compounds (1)–(4); the postulated intermediate is an opened ion due to a “β cleavage” of the C(13)–C(17) bond.
J. Jacquesy, R. Jacquesy, S. Moreau and J. Patoiseau, J. Chem. Soc., Chem. Commun., 1973, 785 DOI: 10.1039/C39730000785
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