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      Permanent link:
      https://www.ias.ac.in/article/fulltext/seca/044/06/0418-0422

    • Keywords

       

      Benzoyl Peroxide; Emodin; Concentrate Sulphuric Acid; Mixed Melting Point; Hydrobromic Acid

    • Abstract

       

      Starting from chrysophanol and frangula-emodin the corresponding ω-hydroxy compounds, alœ-emodin and citreorosein have been prepared adopting the N-bromosuccinimide method. Partial methylation of frangulaemodin to physcion is effected most conveniently by the methyl sulphatepotassium carbonate method. Physcion can be demethylated directly to frangula-emodin by long boiling with hydrobromic acid.

    • Author Affiliations

       

      T R Rajagopalan1 T R Seshadri1

      1. Department of Chemistry, Delhi University, Delhi
    • Dates

       
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