• Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • Keywords


      Acetyl; Coumarin; Acetic Anhydride; Mercuric Chloride; Pyrone

    • Abstract


      The acetyl derivatives of coumaric, 4-methylcoumaric, 5-nitrocoumaric, psoralic and isopsoralic acids have been prepared and their behaviour studied under conditions which bring abouttrans tocis inversion. Under the influence of sunlight, the first three acids produce the corresponding coumarins on prolonged exposure. When heated to above their respective melting points all the acetyl compounds undergo inversion to an extent of 60–80%. Along with the pyrones, highly polymerised resinous compounds are also produced on heating. Treatment with equimolecular amounts of mercuric chloride in aqueous or aqueous alcoholic medium brings about inversion in all the cases with almost theoretical yields.

    • Author Affiliations


      P Suryaprakasa Rao1 V D Nageswara Sastri1 T R Seshadri1

      1. Department of Chemistry, Andhra University, Waltair
    • Dates


© 2021-2022 Indian Academy of Sciences, Bengaluru.