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Abstract

Substances belonging to this group of organic compounds are widely distributed in Nature, being found in plants, both higher and lower fungi and, up to the present time, in one animal source, sheep wool-fat. For a longtime no real differentiation was possible between the tetra- and pentacyclic triterpenes and the sterols. Then the two latter became distinguishable- by their selenium·dehydrogenation products, i. e., picene and naphthalene derivatives from the pentacyclic triterpenes and Diels’ hydrocarbon from the sterols. It is now apparent that those compounds yielding predominantly 1 : 2 : 8-trimethylphenanthrene on dehydrogenation represent yet another class, and this property is regarded as typical of the tetracyclic triterpenes. The group contains both C30 and C31 compounds and, although the latter fall outside Ruzicka’s strict definition of triterpenes (142), it seems desirable to permit this deviation. Members with thirty-two. carbon atoms may well be discovered in due course.

Keywords

Chromic Acid Cyclopropane Ring Ultraviolet Absorption Spectrum Lithium Aluminium Hydride Trisubstituted Double Bond 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Wien Springer Verlag 1955

Authors and Affiliations

  • E. R. H. Jones
    • 1
  • T. G. Halsall
    • 1
  1. 1.ManchesterUK

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