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Abstract

The beautiful blue pigment, named “azulene” from its color a century ago, is a minor constituent of some essential oils and was also obtained by dehydrogenation of various sesquiterpenoids (azulene precursors, proazulenes or azulenogens). Since 1936, when the fundamental structure of azulene was defined by Pfau and Plattner (186) as the bicyclic ring system (I) with condensed unsaturated five- and seven-membered rings, many chemists have become interested in these compounds because of their unique structure. The structures of most naturally occurring azulenes have since been clarified and many more azulenes have been synthesized.

Keywords

Spectral Maximum Ethyl Cyanoacetate Rotatory Dispersion Tetrahedron Letter Exocyclic 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

© Springer-Verlag in Vienna 1961

Authors and Affiliations

  • Tetsuo Nozoe
    • 1
  • Shô Itô
    • 1
  1. 1.SendaiJapan

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