2-Pyrone (α-pyroneorpyran-2-one) is an unsaturated cyclic chemical compound with the molecular formula C5H4O2. It is isomeric with 4-pyrone.
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| IUPAC name
Pyran-2-one | |
| Other names
α-Pyrone | |
| Identifiers | |
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| ECHA InfoCard | 100.007.264 
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CompTox Dashboard (EPA) |
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| Properties | |
| C5H4O2 | |
| Molar mass | 96.085 g·mol−1 |
| Density | 1.197 g/mL |
| Boiling point | 102 to 103 °C (216 to 217 °F; 375 to 376 K) at 20 mmHg |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
2-Pyrone is used in organic synthesis as a building block for more complex chemical structures because it may participate in a variety of cycloaddition reactions to form bicyclic lactones. For example, it readily undergoes Diels-Alder reactions with alkynes producing, upon loss of carbon dioxide, substituted benzenes.[2] The Gogte Synthesis (1938) is a method for the alkylation of certain pyrones with acid chlorides.[citation needed]
The most common natural products containing a 2-pyrone are the bufanolides and kavalactones. Oxovitisin A, a pyranoanthocyanin found in wine, also contains a 2-pyrone element.
6-Amyl-α-pyrone (6PP) is a derivative of 2-pyrone, found in animal foods and heated beef.[3] Due to its good organoleptic properties with coconut aroma, it is used as flavor enhancer in the food industry. Biologically, it is produced by Trichoderma species via solid state fermentation.[4]
