Hydroxy-1,4-benzoquinone

Hydroxy-1,4-benzoquinone, also called hydroxy-para-benzoquinone, is an organic compound with formula C
₆H
₄O
₃, formally derived from 1,4-Benzoquinone by replacing one hydrogen atom with a hydroxyl (OH) group. It is one of three hydroxybenzoquinone isomers and one of the simplest hydroxyquinones.

Hydroxy-1,4-benzoquinone

Names
Preferred IUPAC name 2-Hydroxycyclohexa-2,5-diene-1,4-dione
Other names 2-Hydroxy-p-benzoquinone
Identifiers
CAS Number	2474-72-8 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:18400 N
ChemSpider	133103 N
PubChem CID	151011
UNII	C7I5HV2JFI Y
CompTox Dashboard (EPA)	DTXSID60179468
InChI InChI=1S/C6H4O3/c7-4-1-2-5(8)6(9)3-4/h1-3,9H N Key: GPLIMIJPIZGPIF-UHFFFAOYSA-N N InChI=1/C6H4O3/c7-4-1-2-5(8)6(9)3-4/h1-3,9H Key: GPLIMIJPIZGPIF-UHFFFAOYAA
SMILES C1=CC(=O)C(=CC1=O)O
Properties
Chemical formula	C6H4O3
Molar mass	124.1 g/mol
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

The compound is often called 2-hydroxy-1,4-benzoquinone, but the "2-" prefix is superfluous since there is no other hydroxy derivative of 1,4-benzoquinone. The IUPAC name is 2-hydroxycyclohexa-2,5-diene-1,4-dione.

It is formed by the reaction of 1,4-benzoquinone with hydrogen peroxide and is a byproduct of the metabolism of phenols, such as 1,2,4-benzenetriol.[1] The enzyme 1,2,4-benzenetriol dehydrogenase catalyzes the conversion of 1,2,4-benzenetriol to 2-hydroxy-1,4-benzoquinone, and the enzyme hydroxybenzoquinone reductase catalyzes the reverse reaction. The enzyme 2-hydroxy-1,4-benzoquinone-2-reductase converts it to 1,4-benzoquinone.

It tends to dimerize spontaneously by peroxo bridges.[1]