Page "Aromatic hydrocarbon" Paragraph 1

Some non-benzene-based compounds called heteroarenes, which follow Hückel's rule, are also aromatic compounds.

In these compounds, at least one carbon atom is replaced by one of the heteroatoms oxygen, nitrogen, or sulfur.

Examples of non-benzene compounds with aromatic properties are furan, a heterocyclic compound with a five-membered ring that includes an oxygen atom, and pyridine, a heterocyclic compound with a six-membered ring containing one nitrogen atom.