abstract:Annulenes are completely conjugated monocyclic hydrocarbons. They have the general formula CnHn (when n is an even number) or CnHn+1 (when n is an odd number).
In the light of the helixtheory, aromaticannulenesand non-aromatic annulcncs are all the mixture of the mesomer and raceme, so they haven'topticity activeity.