Hyperacidic media. A novel route to 13α-steroids

Abstract
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.

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