Abstract
Emodin was obtained by the air-oxidation of flavoskyrin in the presence of magnesium acetate, which gave an evidence for the proposed structural formula (I). By the action of chromium trioxide or active manganese dioxide, flavoskyrin yielded dianhydrorugulosin which resulted by oxidative coupling. In methanolic alkaline solution flavoskyrin was converted into a skyrin-like compound.
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