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CAS number 497-23-4 YesY
PubChem 10341
ChemSpider 9917 YesY
KEGG C17601 YesY
MeSH butenolide
ChEBI CHEBI:38118 YesY
Jmol-3D images Image 1
Molecular formula C4H4O2
Molar mass 84.07336
Density 1.185 g/cm3, liquid
Melting point 4 to 5 °C (39 to 41 °F; 277 to 278 K)[1]
Boiling point 86 to 87 °C (187 to 189 °F; 359 to 360 K) 12 mm Hg[1]
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

2-Furanone is a heterocyclic organic compound. Classified as a lactone, this colourless liquid is colloquially called "butenolide." As a class of compounds, substituted derivatives, which are not in fact prepared from the parent 2-furanone, are called butenolides.

Synthesis and reactions[edit]

2-Furanone is prepared by oxidation of furfural:[2]

Oxidation of furfural to furanone.png

It exists in equilibrium with the tautomer 2-hydroxyfuran, which serves as an intermediate in the interconversion between the β- and α-furanones. The β form is the more stable. The interconversion is catalyzed by base.

2-Furanones can be converted to furans by a two-step process of reduction followed by dehydration. First the carbon-oxygen double bond is reduced by trimethylsilylation of the oxygen centre.


  1. ^ a b Sigma-Aldrich Chemicals Product detail
  2. ^ Jan H. Näsman (1993), "3-Methyl-2(5H)-furanone", Org. Synth. ; Coll. Vol. 1: 396