Neben einer Literaturübersicht (48 Zitate) wird die Partialsynthese von Chrysophanol (II) ausgehend von Aloin (I), dem wirksamen Anthron‐Glucosi von Aloe und Senna, sowie die Oxidation der in Chrysarobin enthaltenen Anthrone zu Physcion (III) mit CrO3 und dessen Umwandlung in Frangula‐ Emodin (IV) durch AlCl3/NaCl‐Schmelze beschrieben.
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