Pyrone

Pyrones or pyranones are a class of heterocyclic chemical compounds. They contain an unsaturated six-membered ring, which has one oxygen atom and a carbonyl functional group.¹ There are two isomers, denoted as 2-pyrone and 4-pyrone. The 2-pyrone (or α-pyrone) structure is a lactone and is found in nature as part of the coumarin ring system. The 4-pyrone (or γ-pyrone) structure is an ether–ketone found in some natural chemical compounds such as chromone, maltol and kojic acid.

3-pyrones are zwitterionic, unstable carbonyl ylides. They intermediate some cycloadditions.²

References

Streitwieser, Andrew Jr.; Heathcock, Clayton H. (1985). Introduction to Organic Chemistry (Third ed.). pp. 1038–1040. ISBN 978-0-02-418140-4.
Taber, Douglass F. (July 6, 2020). "The Li synthesis of vinigrol". Organic Chemistry Highlights.

[1] Streitwieser, Andrew Jr.; Heathcock, Clayton H. (1985). Introduction to Organic Chemistry (Third ed.). pp. 1038–1040. ISBN 978-0-02-418140-4.

[2] Taber, Douglass F. (July 6, 2020). "The Li synthesis of vinigrol". Organic Chemistry Highlights.

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References