October 2004
Intermediate to advanced
527 pages
13h 50m
English
Content preview from Advanced Organic Chemistry
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CHAPTER 2
* A conjugated molecule has single and double bonds occurring alternatively as in the following: -C=C-C=C-C=C-C=C- while a molecule have isolated double bonds does not have this feature, such as in -C=C-C=C-C=C-C=C-. A typical example of distinguishing the two types is shown in the structures of isomeric pentadienes:
| H2C=CH-CH=CHCH3 | H2C=CH-CH2-CH=CH2 | |
| 1,3-pentadiene | 1,4-pentadiene | |
| a conjugated diene containing | a non conjugated diene containing | |
| conjugated double bonds | isolated double bonds |
In conjugated molecules resonance structures are considered which impart stabilization as compared to others in which isolated double bonds are present.
** Also called delocalization energy. You have already learnt about the delocalization ...
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