Unformatted text preview: conjugate base has more contributing resonance structures? Use the back of this page if you need more space for your answer. (Hint : Think about the concept of aromaticity…) The conjugate base of 1,3cyclopentadiene is considerably more stable, because it is aromatic . All of the Huckel criteria for aromaticity are met for this anion (cyclic, flat, every atom in the ring has a p orbital, total of 6 π electrons). The conjugate base of 1,3,5cycloheptatriene, on the other hand, is not nearly as stable, even though there are more resonance structures, because if this anion were flat, it would be antiaromatic (total of 8 π electrons). H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H...
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 Fall '08
 RITCHIE/LANG
 Physics, Atom, Electron, Work, Delocalized electron, Huckel

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