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Benzoquinone (C6H4O2) is a 
*1,3-benzoquinone "does not exist, because its structure would be nonplanar and highly strained", though derivatives are known.
An alkylated ''p''-benzoquinone has been found in the rhizomes of '' Iris kemaonensis''.
quinone
The quinones are a class of organic compounds that are formally "derived from aromatic compounds benzene.html" ;"title="uch as benzene">uch as benzene or naphthalene] by conversion of an even number of –CH= groups into –C(=O)– groups with ...
with a single benzene ring
Benzene is an organic chemical compound with the molecular formula C6H6. The benzene molecule is composed of six carbon atoms joined in a planar ring with one hydrogen atom attached to each. Because it contains only carbon and hydrogen atoms, ...
. There are 2 (out of 3 hypothetical) benzoquinones:
* 1,4-Benzoquinone, most commonly, right image (also ''para''-benzoquinone, ''p''-benzoquinone, ''para''-quinone, or just quinone)
* 1,2-Benzoquinone, less commonly, left image (also ''ortho''-benzoquinone, ''o''-benzoquinone, ''ortho''-quinone)
*1,3-benzoquinone "does not exist, because its structure would be nonplanar and highly strained", though derivatives are known.
An alkylated ''p''-benzoquinone has been found in the rhizomes of '' Iris kemaonensis''.
See also
*Arene substitution pattern
Arene substitution patterns are part of organic chemistry IUPAC nomenclature and pinpoint the position of substituents other than hydrogen in relation to each other on an aromatic hydrocarbon.
''Ortho'', ''meta'', and ''para'' substitution
* I ...
References
{{Chemistry index