# Pyrone

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{{Short description|Class of chemical compounds}}
[[Image:2-Pyranone.png|thumb|right|75px|[2-Pyrone](/source/2-Pyrone)]]
[[Image:4-Pyranone.png|thumb|right|75px|[4-Pyrone](/source/4-Pyrone)]]
'''Pyrones''' or '''pyranones''' are a class of [heterocyclic](/source/heterocyclic) chemical compounds. They contain an [unsaturated](/source/Saturated_and_unsaturated_compounds) six-membered ring, which has one oxygen atom and a [carbonyl](/source/carbonyl) [functional group](/source/functional_group).<ref>{{cite book |title=Introduction to Organic Chemistry |first1=Andrew  Jr.|last1=Streitwieser |author-link1=Andrew Streitwieser |first2=Clayton H. |last2=Heathcock |author-link2=Clayton Heathcock |edition=Third |pages=[https://archive.org/details/introductiontoor0003stre/page/1038 1038–1040] |isbn=978-0-02-418140-4 |year=1985 |url=https://archive.org/details/introductiontoor0003stre/page/1038 }}</ref> There are two isomers, denoted as [2-pyrone](/source/2-pyrone) and [4-pyrone](/source/4-pyrone). The 2-pyrone (or α-pyrone) structure is a [lactone](/source/lactone) and is found in nature as part of the [coumarin](/source/coumarin) ring system. The 4-pyrone (or γ-pyrone) structure is an [ether](/source/ether)–[ketone](/source/ketone) found in some natural chemical compounds such as [chromone](/source/chromone), [maltol](/source/maltol) and [kojic acid](/source/kojic_acid).

3-pyrones are [zwitterion](/source/zwitterion)ic, unstable [carbonyl ylide](/source/carbonyl_ylide)s.  They intermediate some cycloadditions.<ref>{{cite news|url=https://www.organic-chemistry.org/Highlights/2020/06July.shtm|website=Organic Chemistry Highlights|title=The Li synthesis of vinigrol|date=July 6, 2020|first=Douglass F.|last=Taber}}</ref>

== See also ==
* [Furanone](/source/Furanone), which has one fewer carbon atom in the ring.
* [Pyridone](/source/Pyridone)s, which contain a nitrogen in place of the oxygen that is part of the ring

==References==
{{Reflist}}
{{heterocyclic-stub}}
Category:Pyrones

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