Monday 30 November 2015

organic chemistry - How to explain (non-/anti-) aromaticity in fulvene with the help of resonance structures?


Can someone please explain why the resonance structures of fulvene 1 is non-aromatic and 2 is anti-aromatic?



resonance structures of fulvene


Why is fulvene non-aromatic, even though it has $4\pi$-electrons and no $\mathrm{sp^3}$ carbons?




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