Summary
The condensation of resorcinol and 4-chloro resorcinol with chloro-and nitro-substitutedβ-resorcylic acids, has yielded the corresponding tetrahydroxy benzophenones, which with the exception of those containing nitro groups, could be cyclised to the respective 3:6-dihydroxy xanthones. In the case of condensations with orcinol, however, 1:6-dihydroxy xanthones could be directly isolated. A number of halo and nitro derivatives of 3:6-dihydroxy xanthone have also been prepared by direct halogenation and nitration of the xanthone, as well as by substitution in the intermediate benzophenone and subsequent cyclisation.
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Kurduker, R., Rao, N.V.S. Search for physiologically active compounds. Proc. Indian Acad. Sci. 57, 280–287 (1963). https://doi.org/10.1007/BF03049025
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DOI: https://doi.org/10.1007/BF03049025