"Decamethyl[5]radialene" has a twist envelope geometry with C2 symmetry while a chair conformation is calculated for [6]radialene and found experimentally for "hexa-(ethylidene)cyclohexane"

Due to their specific pi-electron distributions, hydrocarbons such as perylene and triphenylene are not considered radialenes.One study describes a [6]radialene composed of thiophene units