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1,4-benzoquinone

CAS Number
106-51-4
EC Number
203-405-2
Chemical Formula
C6H4O2
Molecular Weight
108.09 g/mol

Description

1,4-Benzoquinone (CAS 106-51-4 ), also known as quinone or p-BQ, is an oxidizing intermediate used across chemical synthesis, dye manufacturing, and surface treatment processes. It functions primarily as a catalyst, oxidant, and chemical building block in industrial production. In pharmaceutical manufacturing, p-BQ serves as a key intermediate in the synthesis of active compounds. This includes antifungal and antimalarial agents. Dye and pigment producers use it as a precursor for hydroquinone-based colorants and as an oxidant in coupling reactions for printing inks and packaging colorants. In rubber and polymer processing, it acts as a polymerization inhibitor and crosslinking agent, helping control reaction rates during production. This ensures stability and consistency in the final product. Personal care formulators incorporate quinone derivatives as intermediates in hair dye chemistry, where controlled oxidation is critical to color development. It is essential for achieving specific shades. 1,4-Benzoquinone is supplied as a yellow crystalline solid, typically in powder or flake form. Technical grade is the most common commercial specification for industrial applications. Higher-purity grades are available to meet pharmaceutical synthesis requirements. It is packaged in fiber drums or sealed containers due to its sensitivity to moisture and light during storage. Proper handling is required during transit to maintain the integrity of the material. Our supply chain ensures that all chemical building blocks meet rigorous industrial safety protocols. Contact us for supply of 1,4-benzoquinone Request Quote

Other Names (Synonyms)

Quinone | Para-Quinone | para-benzoquinone | p-quinone | p-BQ | Eldoquin | Cyclohexadiene-1,4-dione | Benzoquinone [UN2587]

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point115.7 °C
Boiling Point180 °C
Density1.318 g/cm³ @ Temp: 20 °C
Flash Point38°C
AppearanceQuinone is a yellow, crystalline material or large yellow, monoclinic prisms. Pungent, irritating odor.
ColorYellow to green
Odorirritant odor
FormPowder
Water Solubility10 g/L (25 ºC)
Vapor Pressure0.1 mm Hg ( 25 °C)
Refractive Indexn20/D 1.453
pH4 (1g/l, H2O, 20℃)
Log P0.1-0.3 at 23℃ and pH4.8-5.3

Safety & Handling

Danger
GHS06· ToxicGHS09· EnvironmentGHS07· IrritantGHS08· Health Hazard

Hazard Statements

H301Toxic if swallowed
H315Causes skin irritation
H317May cause an allergic skin reaction
H319Causes serious eye irritation
H331Toxic if inhaled
H335May cause respiratory irritation
H341Suspected of causing genetic defects
H370Causes damage to organs
H371May cause damage to organs
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects H301+
H331Toxic if swallowed or if inhaled

Precautionary Statements

P203Obtain, consult and follow expert instructions for use.
P260Do not breathe dust/fume/gas/mist/vapours/spray.
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P264Wash … thoroughly after handling.
P270Do not eat, drink or smoke when using this product.
P271Use only outdoors or in a well-ventilated area.
P272Contaminated work clothing should not be allowed out of the workplace.
P273Avoid release to the environment.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P316Get emergency medical help immediately.
P318IF exposed or concerned, get medical advice.
P319Get medical advice/attention if you feel unwell.
P321Specific treatment (see … on this label).
P330Rinse mouth.
P391Collect spillage.
P405Store locked up.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P316Get emergency medical help immediately.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P316Get emergency medical help immediately.
P317Get emergency medical help.
P317Get emergency medical help.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P364Take off contaminated clothing and wash it before reuse.
P233Store in a well-ventilated place. Keep container tightly closed.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code29146900
UN Number2587
ADR Class6.1
Packing GroupII
Storage Class4.1B - Flammable solid hazardous materials
WGK (Germany)3