1. Chamomile ( Azulene ) and other minerals are often added. 2. This mechanism would therefore involve an azulene intermediate and is depicted below: 3. The electronic structure ( and colors ) of guaiazulene and azulene are very similar. 4. The four described mechanisms would all result in the isomerization from azulene to naphthalene. 5. A derivative of azulene , guaiazulene is a bicyclic chamomile oil, which also serve as its commercial sources. 6. It was suggested that the rearrangement of naphthalene occurred due to reversibility of the isomerization of azulene to naphthalene. 7. Its low melting point makes guaiazulene difficult to handle, in contrast to the crystalline nature of the parent azulene . 8. Since then, many other isomerizations have been recorded, however the rearrangement of azulene to naphthalene has received the most attention. 9. At the time, they noticed the automerization of a substituted azulene shown below, but no further structural or mechanistic investigations were made. 10. By 1971, when a bibliography of " ab initio " calculations was published, the largest molecules included were naphthalene and azulene .
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