Sorbic acid

Sorbic acid, or 2,4-hexadienoic acid, is a natural organic compound used as a food preservative. It has the chemical formula CH3(CH)4CO2H and the structure H3C−CH=CH−CH=CH−C(=O)OH. It is a colourless solid that is slightly soluble in water and sublimes readily. It was first isolated from the unripe berries of the Sorbus aucuparia (rowan tree), hence its name.

Not to be confused with Ascorbic acid.
Sorbic acid
Names
Preferred IUPAC name
(2E,4E)-Hexa-2,4-dienoic acid
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.003.427
E number E200 (preservatives)
UNII
  • InChI=1S/C6H8O2/c1-2-3-4-5-6(7)8/h2-5H,1H3,(H,7,8)/b3-2+,5-4+ Y
    Key: WSWCOQWTEOXDQX-MQQKCMAXSA-N Y
  • InChI=1/C6H8O2/c1-2-3-4-5-6(7)8/h2-5H,1H3,(H,7,8)/b3-2+,5-4+
    Key: WSWCOQWTEOXDQX-MQQKCMAXBN
  • O=C(O)\C=C\C=C\C
Properties
C6H8O2
Molar mass 112.128 g·mol−1
Density 1.204 g/cm3
Melting point 135 °C (275 °F; 408 K)
Boiling point 228 °C (442 °F; 501 K)
1.6 g/L at 20 °C
Acidity (pKa) 4.76 at 25 °C
Hazards
NFPA 704 (fire diamond)
2
1
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references
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