quinones

https://doi.org/10.1351/goldbook.Q05015
Compounds having a fully conjugated cyclic dione structure, such as that of benzoquinones, derived from @A00441@ compounds by conversion of an even number of number of –CH= groups into –C(=O)– groups with any necessary @R05194@ of double bonds (polycyclic and heterocyclic analogues are included).
Q05015.png
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1362 [Terms] [Paper]