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A compound that has a ring of atoms containing alternating double and single bonds, yet does not have the characteristic properties of aromatic compounds. Such compounds do not obey the Hückel rule. Cyclooctatetraene (C8H8), for instance, has a ring of eight carbon atoms with conjugated double bonds, but the ring is not planar and the compound acts like an alkene, undergoing addition reactions.

Subjects: Chemistry.

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