Pyrones or pyranones are a class of cyclic chemical compounds. They contain an unsaturated six membered ring containing one oxygen atom and a ketone functional group. There are two isomers denoted as 2-pyrone and 4-pyrone. The 2-pyrone (or α-pyrone) structure is found in nature as part of the coumarin ring system. 4-Pyrone (or γ-pyrone) is found...
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http://en.wikipedia.org/wiki/Pyrone
• (n.) An unsaturated cyclic compound, C5H4O2, of which two varieties are known, / and /. /-pyrone is the parent substance of several natural yellow dyestuffs.
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http://thinkexist.com/dictionary/meaning/pyrone/
A keto derivative of pyran. ... Synonym: pyranone. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Py`rone noun [ German
pyron , an abbr. of
pyrokoman .]
(Org. Chem.) An unsaturated cyclic compound, C
5 H
4 O
2 , of which two varieties are known, α and γ. γ-pyrone is the parent substance of several natural yellow dyestuffs.
Found on
http://www.encyclo.co.uk/webster/P/204
Type: Term Pronunciation: pī′rōn Definitions: 1. A keto derivative of pyran. Synonyms: pyranone
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http://www.medilexicon.com/medicaldictionary.php?t=74525
either of two heterocyclic ketones having the formula CHO.
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https://www.infoplease.com/dictionary/pyrone
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