azulene वाक्य
उदाहरण वाक्य
मोबाइल
- Chamomile ( Azulene ) and other minerals are often added.
- This mechanism would therefore involve an azulene intermediate and is depicted below:
- The electronic structure ( and colors ) of guaiazulene and azulene are very similar.
- The four described mechanisms would all result in the isomerization from azulene to naphthalene.
- A derivative of azulene, guaiazulene is a bicyclic chamomile oil, which also serve as its commercial sources.
- It was suggested that the rearrangement of naphthalene occurred due to reversibility of the isomerization of azulene to naphthalene.
- Its low melting point makes guaiazulene difficult to handle, in contrast to the crystalline nature of the parent azulene.
- Since then, many other isomerizations have been recorded, however the rearrangement of azulene to naphthalene has received the most attention.
- At the time, they noticed the automerization of a substituted azulene shown below, but no further structural or mechanistic investigations were made.
- By 1971, when a bibliography of " ab initio " calculations was published, the largest molecules included were naphthalene and azulene.
- In naphth [ " a " ] azulene, a naphthalene ring is condensed at the 1, 2-positions of azulene.
- In naphth [ " a " ] azulene, a naphthalene ring is condensed at the 1, 2-positions of azulene.
- Subsequent work showed that the isomerization of azulene to naphthalene is not readily reversible ( the kcal / mol ) . and is as follows:
- The oldest characterized thermal rearrangement of an aromatic compound was that of the isomerization of azulene to naphthalene by Heilbronner et al . in 1947.
- Another notable feature of azulene is that it violates Kasha's rule by exhibiting fluorescence from an upper-excited state ( S 2 ?
- The isomerization of unsubstituted azulene to naphthalene was the first reported thermal transformation of an aromatic hydrocarbon, and has consequently been the most widely studied rearrangement.
- For example, the cyclopentadienyl anion and the cycloheptatrienylium cation are both considered to be aromatic ions, and the azulene molecule can be approximated as a combination of both.
- Azulene has a long history, dating back to the 15th century as the azure-blue chromophore obtained by steam distillation of wormwood and named in 1863 by Septimus Piesse.
- Likewise, since the characterization of the automerization of naphthalene by Scott in 1977, azulene, benz [ " a " ] anthracene and even benzene have been described.
- The diradical mechanism has been supported by Homolysis of the weakest bond in azulene occurs, followed by a hydrogen shift and ring closure so as to retain the aromaticity of the molecule.
- अधिक वाक्य: 1 2
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