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Aurin

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Aurin
Skeletal formula of aurin
Ball-and-stick model
Names
IUPAC names 4--
-2,5-cyclohexadien-1-one
Other names Aurin, corallin, p-rosolic acid, C.I. 43800
Identifiers
CAS Number
3D model (JSmol)
Beilstein Reference 2055205
ChEMBL
ChemSpider
ECHA InfoCard 100.009.129 Edit this at Wikidata
EC Number
  • 210-041-8
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C19H14O3/c20-16-7-1-13(2-8-16)19(14-3-9-17(21)10-4-14)15-5-11-18(22)12-6-15/h1-12,20-21HKey: FYEHYMARPSSOBO-UHFFFAOYSA-N
  • InChI=1/C19H14O3/c20-16-7-1-13(2-8-16)19(14-3-9-17(21)10-4-14)15-5-11-18(22)12-6-15/h1-12,20-21HKey: FYEHYMARPSSOBO-UHFFFAOYAG
SMILES
  • C1=CC(=O)C=CC1=C(C2=CC=C(C=C2)O)C3=CC=C(C=C3)O
Properties
Chemical formula C19H14O3
Molar mass 290.313 g/mol
Density 1.283 g cm
Melting point 308 °C (decomp.)
Solubility in water insoluble
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1 1 0
Flash point 308 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound
For the French commune, see Aurin, Haute-Garonne.
For the Aragonese village, see Aurin, Sabiñánigo, Huesca, España.

Aurin (C.I. 43800), sometimes named rosolic acid or corallin is an organic compound, forming yellowish or deep-red crystals with greenish metallic luster. It is practically insoluble in water, freely soluble in alcohol. It is soluble in strong acids to form yellow solution, or in aqueous alkalis to form carmine red solutions. Due to this behaviour it can be used as pH indicator with pH transition range 5.0 - 6.8. It used as intermediate in manufacturing of dyes.

Synthesis

Aurin is formed by heating of phenol and oxalic acid in concentrated sulfuric acid.

References

External links

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