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Merck
CN

13-1940

Hydroquinone

SAJ first grade, ≥99.0%

Synonym(s):

1,4-Benzenediol, 1,4-Dihydroxybenzene, HQ

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About This Item

Linear Formula:
C6H4-1,4-(OH)2
CAS Number:
123-31-9
Molecular Weight:
110.11
EC Number:
204-617-8
UNSPSC Code:
12352002
PubChem Substance ID:
329750096
Beilstein/REAXYS Number:
605970
MDL number:
MFCD00002339
Assay:
≥99.0%
Grade:
SAJ first grade
Bp:
285 °C (lit.)
Vapor pressure:
1 mmHg ( 132 °C)

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InChI key

QIGBRXMKCJKVMJ-UHFFFAOYSA-N

InChI

1S/C6H6O2/c7-5-1-2-6(8)4-3-5/h1-4,7-8H

SMILES string

Oc1ccc(O)cc1

grade

SAJ first grade

vapor density

3.81 (vs air)

vapor pressure

1 mmHg ( 132 °C)

assay

≥99.0%

form

crystalline

autoignition temp.

930 °F

availability

available only in Japan

dilution

(for analytical testing)

pH

3.7 (70 g/L)

bp

285 °C (lit.)

mp

172-175 °C (lit.)

solubility

water: soluble 50 g/L

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Danger

Hazard Classifications

Acute Tox. 4 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - Carc. 2 - Eye Dam. 1 - Muta. 2 - Skin Sens. 1B

Storage Class

11 - Combustible Solids

wgk

WGK 3

flash_point_f

329.0 °F - closed cup

flash_point_c

165 °C - closed cup

ppe

Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges

Regulatory Information

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Certificates of Analysis (COA)

Lot/Batch Number
U6549
U2487
U8459
U2378
U6264

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Yaqi Hu et al.
Biosensors & bioelectronics, 47, 45-49 (2013-04-03)
A novel light "on-off" photoelectrochemical sensing for the sensitive determination of hydroquinone was developed based on the porphyrin-functionalized Au nanoparticles on graphene (porphyrin/AuNPs/graphene). Gold nanoparticles (AuNPs) were firstly modified onto graphene sheets using NaBH4 as reductant and the porphyrin/AuNPs/graphene nanocomposites
P Carbonnelle et al.
Toxicology and applied pharmacology, 132(2), 220-226 (1995-06-01)
Decreased interleukin-1 (IL-1) production by mononuclear phagocytes has been shown to contribute to benzene myelotoxicity in animals. The study presented here was designed to examine the relevance of this mechanism in humans. Fresh human blood monocytes were exposed to 0.001-10
Jacob Levitt
Journal of the American Academy of Dermatology, 57(5), 854-872 (2007-05-01)
Recently, the US Food and Drug Administration proposed a ban on over-the-counter hydroquinone mainly on the basis of high absorption, reports of exogenous ochronosis in humans, and murine hepatic adenomas, renal adenomas, and leukemia with large doses over extended time
A P DeCaprio
Critical reviews in toxicology, 29(3), 283-330 (1999-06-24)
Hydroquinone (HQ) is a high-volume commodity chemical used as a reducing agent, antioxidant, polymerization inhibitor, and chemical intermediate. It is also used in over-the-counter (OTC) drugs as an ingredient in skin lighteners and is a natural ingredient in many plant-derived
Douglas McGregor
Critical reviews in toxicology, 37(10), 887-914 (2007-11-21)
The toxicology of hydroquinone has been reviewed on a number of previous occasions. This review targets its potential for carcinogenicity and possible modes of carcinogenic action. The evaluation made by IARC (1999) of its carcinogenic risk to humans was that
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