 Organic synthesis of a hexabenzocoronene starts with an Aldol condensation reaction of dibenzyl ketone with a benzil derivative to give a substituted cyclopentadienone.A Diels–Alder reaction with alkyne and subsequent expulsion of carbon monoxide gives a hexaphenylbenzene.The adjacent pairs of benzene rings undergo oxidative electrocyclic reactions and aromatization by oxidation by Iron(III) chloride in nitromethane.