Chinones

Large group, usually yellow or red coloured, of organic substances which are formed by oxidation of phenols or polycyclic aromatic hydrocarbons. Chino ne contain 2 carbonyl groups in ortho or para position.
Among the quinone derivatives there is a wide range of important substances such as ubiquinone-10 (coenzyme Q10) or vitamin K. Synonymously, "quinone" also refers to the compound 1,4-benzoquinone, a substance which is formed by oxidation from 1,4-dihydroxybenzene (hydroquinone).

The name quinone is derived from quinic acid, the oxidation of which leads, among other things, to 1,4-benzoquinone.