1,2-Benzoquinone

1,2-Benzoquinone
Names
	Preferred IUPAC name Cyclohexa-3,5-diene-1,2-dione[1]
	Other names ortho-Benzoquinone; o-Benzoquinone; o-Quinone;
Identifiers
CAS Number	583-63-1 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:17253 ;
ChemSpider	10941 ;
ECHA InfoCard	100.243.463
KEGG	C02351 ;
PubChem CID	11421;
UNII	SVD1LJ47R7 ;
CompTox Dashboard (EPA)	DTXSID60894765 ;
	InChI InChI=1S/C6H4O2/c7-5-3-1-2-4-6(5)8/h1-4H Key: WOAHJDHKFWSLKE-UHFFFAOYSA-N ; InChI=1/C6H4O2/c7-5-3-1-2-4-6(5)8/h1-4H Key: WOAHJDHKFWSLKE-UHFFFAOYAR;
	SMILES O=C1/C=C\C=C/C1=O; C1=CC(=O)C(=O)C=C1;
Properties
Chemical formula	C6H4O2
Molar mass	108.096 g·mol−1
Density	1.424 g/cm3
Boiling point	213.3 °C (415.9 °F; 486.4 K)
Hazards
Flash point	76.4 °C (169.5 °F; 349.5 K)
Related compounds
Related compounds	1,4-benzoquinone ; quinone
	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

1,2-Benzoquinone, also called ortho-benzoquinone, is an organic compound with formula C₆H₄O₂. It is one of the two isomers of quinone, the other being 1,4-benzoquinone. It is a red volatile solid that is soluble in water and ethyl ether. It is rarely encountered because of its instability, but it is of fundamental interest as the parent compound of many derivatives which are known.[2]

Structure

The molecule has C_2v symmetry. X-ray crystallography shows that the double bonds are localized, with alternatingly long and short C-C distances within the ring. The C=O distances of 1.21 Å are characteristic of ketones.[3]

Preparation and occurrence

1,2-Benzoquinone is produced on oxidation of catechol exposed to air in aqueous solution[4] or by ortho oxidation of a phenol.[4]

It is a precursor to melanin.[5]

A strain of the bacterium Pseudomonas mendocina metabolises benzoic acid, yielding 1,2-benzoquinone via catechol.[6]

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References

Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 728. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.
Liao, Chun-Chen; Peddinti, Rama Krishna (2002). "Maskedo-Benzoquinones in Organic Synthesis". Accounts of Chemical Research. 35 (10): 856–866. doi:10.1021/ar000194n. PMID 12379138.
MacDonald, Alistair L.; Trotter, James (1973). "Crystal and molecular structure of o-benzoquinone". Journal of the Chemical Society, Perkin Transactions 2 (4): 476. doi:10.1039/P29730000476.
Magdziak, D.; Rodriguez, A. A.; Van De Water, R. W.; Pettus, T. R. R. (2002). "Regioselective oxidation of phenols to o-quinones with o-iodoxybenzoic acid (IBX)". Org. Lett. 4 (2): 285–288. doi:10.1021/ol017068j. PMC 1557836. PMID 11796071.
Enzymatic Browning
Chanda Parulekar and Suneela Mavinkurve (2006). "Formation of ortho-benzoquinone from sodium benzoate by Pseudomonas mendocina P₂d" (PDF). Indian Journal of Experimental Biology. 44: 157–162. PMID 16480184.

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[IUPAC2013_728-1] Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 728. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.

[2] Liao, Chun-Chen; Peddinti, Rama Krishna (2002). "Maskedo-Benzoquinones in Organic Synthesis". Accounts of Chemical Research. 35 (10): 856–866. doi:10.1021/ar000194n. PMID 12379138.

[3] MacDonald, Alistair L.; Trotter, James (1973). "Crystal and molecular structure of o-benzoquinone". Journal of the Chemical Society, Perkin Transactions 2 (4): 476. doi:10.1039/P29730000476.

[mag-4] Magdziak, D.; Rodriguez, A. A.; Van De Water, R. W.; Pettus, T. R. R. (2002). "Regioselective oxidation of phenols to o-quinones with o-iodoxybenzoic acid (IBX)". Org. Lett. 4 (2): 285–288. doi:10.1021/ol017068j. PMC 1557836. PMID 11796071.

[5] Enzymatic Browning

[paru-6] Chanda Parulekar and Suneela Mavinkurve (2006). "Formation of ortho-benzoquinone from sodium benzoate by Pseudomonas mendocina P₂d" (PDF). Indian Journal of Experimental Biology. 44: 157–162. PMID 16480184.