Compounds having a fully conjugated cyclic dione structure, such as that of benzoquinones, derived from aromatic compounds by conversion of an even number of number of
–CH= groups into
–C(=O)– groups with any necessary rearrangement of double bonds (polycyclic and heterocyclic analogues are included).
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Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1362 (https://doi.org/10.1351/pac199567081307)