Abstract
1. A steroidal divinyl ketone, namely 21-homopregna-5,16,21-trien-3β-ol-20-one 3-acetate (III), the starting product in the synthesis of polyhydroxy steroids, was synthesized in 64% yield by starting with the readily-available dehydropregnenolone acetate via the Mannich reaction and subsequent cleavage. 2. A siudy was made of the reactivity of the conjugated bonds in divinyl ketone (III) under the conditions of hydration and the addition of alcohols in acid and alkaline media.
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