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Annulenes
Eight electron systems [8]-annulene (Cyclooctatetraene, COT)
Annulenes - Eight Electron System, 8 Annulenes

Ten electron systems [10] annulenes

From electron count a ten-electron system should be a Huckel system and aromatic but the molecules listed below are not planar so none of them are aromatic.

Annulenes - Ten Electron System, 10 Annulenes

In A there is no angle strain, but the 1,6-H atoms have a lot of steric hindrance between them so the molecule is forced out of planarity. The molecule has not been prepared.

B is a regular decagon and the angle should be 144, for greater than 120, so there is lack of planarity.

C also has some angle strain. How ever 10 electron planar, aromatic systems are known.

Annulenes - Ten Electron System, 10 Annulenes
Annulenes - Ten Electron System, 10 Annulenes
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