Hückel's 4n + 2 rule

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Hückel's 4n + 2 rule [′hu̇k·əlz ¦fȯr ‚en pləs ′tü ‚rül]

(organic chemistry)

Aromatic (ring) compounds must have 4n+ 2 pi-bonding electrons, wherenis a whole number and generally limited ton= 0 to 5. Whenn= 1, for example, there are six pi-electrons, as for benzene. Also known as Hückel's rule.

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