Radical anions having the structure O−–Z–O·
where Z is an ortho
- or para
-arylene group or analogous heteroarylene group; they are formally generated by the addition of an electron to a quinone.
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1365 (https://doi.org/10.1351/pac199567081307)