4-Ethylguaiacol

4-Ethylguaiacol, often abbreviated to 4-EG, is a phenolic compound with the molecular formula C9H12O2. It can be produced in wine and beer by Brettanomyces.[2] It is also frequently present in bio-oil produced by pyrolysis of lignocellulosic biomass.[3]

4-Ethylguaiacol
Names
Preferred IUPAC name
4-Ethyl-2-methoxyphenol
Other names
p-Ethylguaiacol
Homocresol
Guaiacyl ethane
2-Methoxy-4-ethylphenol
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.018.637
UNII
Properties
C9H12O2
Molar mass 152.193 g·mol−1
Appearance Colorless liquid
Density 1064 kg/m3 (20 °C)[1]
Melting point 15 °C (59 °F; 288 K)
Boiling point 235.1 °C (455.2 °F; 508.2 K) [1]
Hazards
Safety data sheet External MSDS
Xi
S-phrases (outdated) S26 S37/39
NFPA 704 (fire diamond)
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
2
0
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

Winemaking

It is produced along with 4-ethylphenol (4-EP) in wine and beer by the spoilage yeast Brettanomyces.[2] When it is produced by the yeast to concentrations greater than the sensory threshold of >600 µg/L, it can contribute bacon, spice, clove, or smoky aromas to the wine. On their own these characters can be quite attractive in a wine, however as the compound usually occurs with 4-EP whose aromas can be more aggressive, the presence of the compound often signifies a wine fault. The ratio in which 4-EP and 4-EG are present can greatly affect the organoleptic properties of the wine.

Bio-oil

4-Ethylguaiacol can also be produced by pyrolysis of lignocellulosic biomass. It is produced from the lignin, along with many of the other phenolic compounds present in bio-oil. In particular, 4-ethylguaiacol is derived from guaiacyl in the lignin.[3]

See also

References
  1. Mozaffari, Parsa; Järvik, Oliver; Baird, Zachariah Steven (2020-10-28). "Vapor Pressures of Phenolic Compounds Found in Pyrolysis Oil". Journal of Chemical & Engineering Data. doi:10.1021/acs.jced.0c00675. ISSN 0021-9568.
  2. Caboni, Pierluigi; Sarais, Giorgia; Cabras, Marco; Angioni, Alberto (2007). "Determination of 4-Ethylphenol and 4-Ethylguaiacol in Wines by LC-MS-MS and HPLC-DAD-Fluorescence". Journal of Agricultural and Food Chemistry. 55 (18): 7288–93. doi:10.1021/jf071156m. PMID 17676867.
  3. Lyu, Gaojin; Wu, Shubin; Zhang, Hongdan (2015). "Estimation and Comparison of Bio-Oil Components from Different Pyrolysis Conditions". Frontiers in Energy Research. 3. doi:10.3389/fenrg.2015.00028. ISSN 2296-598X.
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