annulene
annulene
A mancude monocyclic hydrocarbon without side chains of the general formula C<small><sub><em>n</em></sub></small>H<small><sub><em>n</em></sub></small> (<em>n</em> is an even number) or C<small><sub><em>n</em></sub></small>H<small><sub><em>n</em>+1</sub></small> (<em>n</em> is an odd number). In systematic nomenclature an annulene with seven or more carbon atoms may be named [<em>n</em>]annulene, where <em>n</em> is the number of carbon atoms.