Zur Synthese des 3β‐Hydroxy‐19‐nor‐Δ5,7,9(10)‐pregnatrien‐20‐ons (VIII) wird Ergosterin (I) mit Eosin Yals Sensibilisator zum Bisergostatrienol (II) (93% Ausbeute) photodimerisiert, das durch Erhitzen in Carbitol (5 Min. unter Stickstoff) zum Neoergosterin (III) (33%) aromatisiert wird.
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