Bei der Behandlung mit Jod in Pyridin erhält man aus Androst‐4‐en‐3,17‐dion‐ 19‐säure (I) über diskutierte Zwischenstufen wie (II) und (III) das 19‐Nor‐steroiddiendion (IV), das mit weiterem Jod zu (V) aromatisiert wird.
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