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Why is cyclopentadiene anion is aromatic but cycloheptatrienyl anion is not?
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Miguel
Why is cyclopentadiene anion is aromatic but cycloheptatrienyl anion is not?
I just can't seem to figure this out. The cyclopentadienyl anion (1) is aromatic, but the cycloheptatrienyl anion (2) is not, though its cation (3) is. Why?
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