Cyclocta-1,3,5,7-tetraene (COT) have four double bonds and four single bond alternatively hence their is lack of resonance. The reason behind this is bigger size of ring and finally cyclocta-1,3,5'7-tetraene is to be non-planar.
The structure is:
However, the compound have four double bonds means eight (8) π electrons.
It may be aromatic, it has to have 4n+2 electrons (2, 6, 10, etc.).
Anti-aromatic systems have 4n electrons (4, 8, 12, etc.).
It may be expected that the molecule was planar and anti-aromatic.
However, actually the molecule takes a tub-shaped (non planer ) conformation in its native state. Since, it is not a planar molecule, it becomes non-aromatic instead of anti-aromatic.
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