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Coenzymes and cofactors

Quinone

Also known as p-benzoquinone, 1,4-Benzoquinone, Benzoquinone

CAS 106-51-4Formula C6H4O2Molar mass 108.10 g/molEC 203-405-2
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Hazardous to the environment 109 suppliers listed
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Quinone chemical structure, C6H4O2, CAS 106-51-4
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Yellow monoclinic prisms from water or petroleum ether
Melting point
115.7 °C
Boiling point
Ca. 180
Density
Relative density of the vapour/air-mixture at 20 °C (air = 1): 1.0
Flash point
38 to 93
HS code
291469
Category
Coenzymes and cofactors
UN number
UN 2587
Illustrative photo, yellow pigment powder in an open kraft paper sack in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Quinone?

Plain description, key identifiers and synonyms

1,4-benzoquinone is the simplest member of the class of 1,4-benzoquinones, obtained by the formal oxidation of hydroquinone to the corresponding diketone. It is a metabolite of benzene. It has a role as a cofactor, a mouse metabolite and a human xenobiotic metabolite.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
cyclohexa-2,5-diene-1,4-dione
CAS number
106-51-4 CAS number cross-checkedOther or deprecated CAS: 3225-29-4
EC numbers
203-405-2, 946-235-0
Molecular formula
C6H4O2
UNII
3T006GV98U
MDL number
MFCD00001591
InChIKey
AZQWKYJCGOJGHM-UHFFFAOYSA-N
InChI
InChI=1S/C6H4O2/c7-5-1-2-6(8)4-3-5/h1-4H
SMILES (canonical and isomeric)
C1=CC(=O)C=CC1=O

Synonyms

  • p-benzoquinone
  • 1,4-Benzoquinone
  • Benzoquinone
  • p-Quinone
  • cyclohexa-2,5-diene-1,4-dione
  • para-Benzoquinone
  • Chinone
  • 2,5-Cyclohexadiene-1,4-dione
  • para-Quinone
  • Cyclohexadienedione
  • 1,4-Benzoquine
  • 1,4-Cyclohexadienedione
  • Steara pbq
  • 1,4-Dioxybenzene
  • Benzo-chinon
  • p-Chinon
  • Benzo-1,4-quinone
  • Chinon
  • 1,4-Diossibenzene
  • 1,4-Dioxy-benzol
  • 1,4-Cyclohexadiene dioxide
  • USAF P-220
  • RCRA waste number U197
  • parabenzochinon
  • benzochinon
Show all 33 synonyms
  • PBQ 2
  • Semiquinone anion
  • semiquinone radicals
  • Cyclohexadiene-1,4-dione
  • [1,4]benzoquinone
  • Quinone1,4-Benzoquinone
  • 1,4-Benzoquinone, SKF-21232
  • 1,4 benzoquinone

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Yellow monoclinic prisms from water or petroleum etherexp.
Odour
PENETRATING ODOR RESEMBLING THAT OF CHLORINEexp.
Melting point
115.7 °Cexp.
Boiling point
Ca. 180exp.
Density
Relative density of the vapour/air-mixture at 20 °C (air = 1): 1.0exp.
Flash point
38 to 93exp.
Autoignition temperature
560 °Cexp.
Solubility
1.113 × 10⁺⁴ mg/l @ 18 °Cexp.
Vapour pressure
0.1 MM HG AT 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
108.10 g/molcalc.
Exact mass
108.0211 Dacalc.
LogP (octanol/water)
0.25calc.
Topological polar surface area
34.14 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
8calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=C1C=CC(=O)C=C1

O=C1C=CC(=O)C=C1

1 ring, 8 atoms. This chemical is the scaffold itself.

738 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS09: Hazardous to the environment
Hazardous to the environment
211NFPA 704 rating

Hazard statements

  • H301Toxic if swallowed.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H331Toxic if inhaled.
  • H335May cause respiratory irritation.
  • H400Very toxic to aquatic life.
Precautionary statements (22)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2587
Transport hazard class
6.1
Packing group
II

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Quinone suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 109 suppliers
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Where suppliers are based

109 suppliers in 18 countries

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Quinone price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Tanning hides, making gelatin insol, strengthening animal fibers.

For p-benzoquinonedioxime, a rubber accelerator, for quinhydrone used in ph electrodes, for 2,3-dichloro-5,6-dicyanobenzoquinone, chem intermediate for dyes-eg, vat yellow 5 (former use).

Used in cosmetic industries primarily because of its ability to transform certain nitrogen-containing cmpd into variety of colored substances.

1,4-Benzoquinone is used in the manufacture of unsaturated polyesters as a polymerization inhibitor.

Quinone is used as a chemical intermediate, a polymerization inhibitor, an oxidizing agent, a photographic chemical, a tanning agent, and a chemical reagent.

Industrial uses: Polymerization promoter.

Pharmacological actions

  • Indicators and Reagents

Roles

  • animal metabolite
  • cofactor
  • eukaryotic metabolite
  • human metabolite
  • human xenobiotic metabolite
  • mammalian metabolite
  • metabolite
  • mouse metabolite
  • xenobiotic metabolite

Functional uses

  • Chemical reaction regulator

How it is made

Quinone can be prepd ... By the reduction of hydroquinone with bromic acid.

Oxidation of aniline with manganese dioxide & sulfuric acid

/1,4-Benzoquinone is prepd/ by the oxidation of aniline with chromic acid, extraction with ether and distillation.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 606-013-00-3

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Quinone is traded under.

HS 2914.69Indicative HS code

Quinones, other

World exports in 2024
$162M
−10.1% vs 2023, imports $157M
2019 to 2024
Top exporters
  1. China32.8%
  2. Netherlands29.3%
  3. Japan13.8%
Top importers
  1. United States23.0%
  2. India * partner reported16.1%
  3. Thailand7.9%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Quinone is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Quinone, based on the data on this page

What is Quinone?

1,4-benzoquinone is the simplest member of the class of 1,4-benzoquinones, obtained by the formal oxidation of hydroquinone to the corresponding diketone. It is a metabolite of benzene. It has a role as a cofactor, a mouse metabolite and a human xenobiotic metabolite.

What is the CAS number of Quinone?

The CAS registry number of Quinone is 106-51-4. Other or deprecated CAS numbers: 3225-29-4.

What is the molecular formula and weight of Quinone?

The molecular formula of Quinone is C6H4O2 and its molar mass is 108.10 g/mol.

What is Quinone used for?

Tanning hides, making gelatin insol, strengthening animal fibers. For p-benzoquinonedioxime, a rubber accelerator, for quinhydrone used in ph electrodes, for 2,3-dichloro-5,6-dicyanobenzoquinone, chem intermediate for dyes-eg, vat yellow 5 (former use).

Is Quinone hazardous?

Quinone carries the GHS signal word "Danger". Main hazards: toxic if swallowed, causes skin irritation, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Quinone?

Quinone is usually classified under HS code 291469 (Quinones, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Quinone?

CompoundList lists 109 suppliers of Quinone in China, United States, India, Germany and 14 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Quinone in India?

11 suppliers in India list Quinone on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Quinone?

Suppliers quote Quinone on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Quinone

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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