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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
quinone
The quinones are a class of organic compounds that are formally "derived from aromatic compounds
with a single uch as benzene or naphthalene
Uch ( pa, ;
ur, ), frequently referred to as Uch Sharīf ( pa, ;
ur, ; ''"Noble Uch"''), is a historic city in the southern part of Pakistan's Punjab province. Uch may have been founded as Alexandria on the Indus, a town founded by Alexand ...
by conversion of an even number of –CH= groups into –C(=O)– groups with any necessary rearrangement of double ...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
1,4-Benzoquinone, commonly known as ''para''-quinone, is a chemical compound with the formula C6H4O2. In a pure state, it forms bright-yellow crystals with a characteristic irritating odor, resembling that of chlorine, bleach, and hot plastic o ...
, 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 rhizome
In botany and dendrology, a rhizome (; , ) is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are also called creeping rootstalks or just rootstalks. Rhizomes develop from axillary buds and grow hori ...
s of ''Iris kemaonensis
''Iris kemaonensis'', the Kumaon iris, is a plant species in the genus '' Iris'', it is also in the subgenus '' Iris'' and in the section ''Pseudoregelia''. It is a rhizomatous perennial, from Tibetan China, Bhutan, India, Kashmir and Nepal. I ...
''.
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