4-Vinylphenol

4-Vinylphenol is a phenolic compound found in wine and beer. It is produced by the spoilage yeast Brettanomyces. When it reaches concentrations greater than the sensory threshold, it can give the wine aromas described as barnyard, medicinal, band-aids, and mousy. In wine, 4-vinylphenol can react with other molecules, such as anthocyanidins, to produce new chemical compounds.[1] In white wines vinylphenols are dominant (4-vinylphenol 70-1 150 μg/l, 4-vinylguaiacol 10-490 μg/l) whereas, in red wines, it is the corresponding ethyl phenols.[2]

4-Vinylphenol

Names
Preferred IUPAC name 4-Ethenylphenol
Other names p-Vinylphenol p-Hydroxystyrene 4-VP
Identifiers
CAS Number	2628-17-3
3D model (JSmol)	Interactive image
ChemSpider	56234
ECHA InfoCard	100.018.276
PubChem CID	62453
UNII	OA7V1SM8YL
CompTox Dashboard (EPA)	DTXSID7073301
InChI InChI=1S/C8H8O/c1-2-7-3-5-8(9)6-4-7/h2-6,9H,1H2 Key: FUGYGGDSWSUORM-UHFFFAOYSA-N InChI=1/C8H8O/c1-2-7-3-5-8(9)6-4-7/h2-6,9H,1H2 Key: FUGYGGDSWSUORM-UHFFFAOYAQ
SMILES C=CC1=CC=C(C=C1)O
Properties
Chemical formula	C8H8O
Molar mass	120.15 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Biochemistry

The conversion of p-coumaric acid to 4-ethylphenol by Brettanomyces via 4-vinylphenol

4-Ethylphenol is produced from the precursor p-coumaric acid. Brettanomyces converts this to 4-vinylphenol via the enzyme cinnamate decarboxylase.[3] 4-Vinylphenol is further reduced to 4-ethylphenol by the enzyme vinyl phenol reductase. Coumaric acid is sometimes added to microbiological media, enabling the positive identification of Brettanomyces by smell.

See also

• 4-Ethylguaiacol
• Yeast in winemaking
• Wine fault
• Wine chemistry
• Poly-4-vinylphenol (polyvinylphenol or PVP) is a plastic structurally similar to polystyrene.

References

1. Structure of new anthocyanin-derived wine pigments. Hélène Fulcrand, Paulo-Jorge Cameira dos Santos, Pascale Sarni-Manchado, Véronique Cheynier and Jean Favre-Bonvin, J. Chem. Soc., Perkin Trans. 1, 1996, pages 735-739, doi:10.1039/P19960000735
2. Flüchtige phenolische Verbindungen in Wein = Volatil phenolic compounds of wine. Rapp A. and Versini G., Deutsche Lebensmittel-Rundschau, 1996, vol. 92, no2, pages 42-48, INIST:2990913 (German)
3. Brettanomyces Monitoring by Analysis of 4-ethylphenol and 4-ethylguaiacol Archived 2008-02-19 at the Wayback Machine at etslabs.com

External links

• 4-Ethylphenol oral toxicity data