Jump to main content
Jump to site search
Publishing
Advanced

Issue 0, 1972
Previous Article Next Article

Chemical investigation of ceylonese plants. Part I. Extractives of Calophyllum calaba L. and Calophyllum bracteatum Thw. (Guttiferae)

R. Somanathan  and  M. U. S. Sultanbawa 

Abstract

The bark and timber extracts of C. calaba L. and C. bracteatum Thw. have been studied. A new di-isoprenylated xanthone, named calabaxanthone, isolated from the barks of both species has been shown to be 5-hydroxy-8-methoxy-2,2-dimethyl-7-(3-methylbut-2-enyl)-2H,6H-pyrano[3,2-b]xanthen-6-one (II). The bark extracts of both species have yielded taraxerol (Ia) and taraxerone (Ib). The bark extracts of C. bracteatum Thw. have also yielded calophyllolide (XI). The timber extracts of C. calaba L. have given a hitherto unknown xanthone 1,8-dimethoxy-2-hydroxyxanthone (VII), eight other known xanthones, β-sitosterol, and stigmasterol. The timber extracts of C. bracteatum Thw. have given two new xanthones 1,3,5-trihydroxy-2-methoxyxanthone (XII) and 1,8-dihydroxy-3,5,7-trimethoxyxanthone (XVI), four other known xanthones, betulinic acid, β-sitosterol, and stigmasterol. Structures of the new xanthones have been elucidated.

Back to tab navigation
Download options Please wait...

Article type: Paper
DOI: 10.1039/P19720001935
Citation: J. Chem. Soc., Perkin Trans. 1, 1972,0, 1935-1943
  •   Request permissions

    Chemical investigation of ceylonese plants. Part I. Extractives of Calophyllum calaba L. and Calophyllum bracteatum Thw. (Guttiferae)

    R. Somanathan and M. U. S. Sultanbawa, J. Chem. Soc., Perkin Trans. 1, 1972, 0, 1935
    DOI: 10.1039/P19720001935

    If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using RightsLink. Go to our Instructions for using RightsLink page for details.

    Authors contributing to RSC publications (journal articles, books or book chapters) do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      Reproduced from Ref. XX with permission from the Centre National de la Recherche Scientifique (CNRS) and The Royal Society of Chemistry.
    • For reproduction of material from PCCP:
      Reproduced from Ref. XX with permission from the PCCP Owner Societies.
    • For reproduction of material from PPS:
      Reproduced from Ref. XX with permission from the European Society for Photobiology, the European Photochemistry Association, and The Royal Society of Chemistry.
    • For reproduction of material from all other RSC journals and books:
      Reproduced from Ref. XX with permission from The Royal Society of Chemistry.

    If the material has been adapted instead of reproduced from the original RSC publication "Reproduced from" can be substituted with "Adapted from".

    In all cases the Ref. XX is the XXth reference in the list of references.

    If you are the author of this article you do not need to formally request permission to reproduce figures, diagrams etc. contained in this article in third party publications or in a thesis or dissertation provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Reproduced by permission of The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC
    • For reproduction of material from PCCP:
      [Original citation] - Reproduced by permission of the PCCP Owner Societies
    • For reproduction of material from PPS:
      [Original citation] - Reproduced by permission of The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC
    • For reproduction of material from all other RSC journals:
      [Original citation] - Reproduced by permission of The Royal Society of Chemistry

    If you are the author of this article you still need to obtain permission to reproduce the whole article in a third party publication with the exception of reproduction of the whole article in a thesis or dissertation.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements