Noun
arene (plural arenes)
(organic chemistry) Any monocyclic or polycyclic aromatic hydrocarbon.
Aromatic substitution In aromatic substitution one substituent on the arene ring, usually hydrogen, is replaced by another substituent. Source: Internet
Diels–Alder reactions of alkynes with pyrone or cyclopentadienone with expulsion of carbon dioxide or carbon monoxide also form arene compounds. Source: Internet