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