is a minor constituent of some essential oils and was also obtained by dehydrogenation of various sesquiterpenoids (azulene precursors， 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. ， when the fundamental structure of azulene was defined by P fau and P lattner (186) as the bicyclic ring system (I) with condensed unsaturated five- and seven-membered rings。

proazulenes or azulenogens). Since 1936， The beautiful blue pigment， named “azulene” from its color a century ago，。

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