Illustrated Glossary of Organic Chemistry

Cyclooctatetraene (1,3,5,7-cyclooctatetraene; COT): An unsaturated aliphatic hydrocarbon of molecular formula C₈H₈. Because of its nonplanarity (tub shape; see molecular model kit picture), cyclooctatetraene is neither aromatic or antiaromatic (i.e., it is nonaromatic).

Molecular Structure of 1,3,5,7-Cyclooctatetraene

Kekule structure		Bond-line structure		Ball and spoke model		Space-filling model		Molecular model kit