Overview
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.
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Physical Properties
| Melting Point | 115.7 °C |
| Boiling Point | 180 °C |
| Density | 1.318 g/cm³ @ Temp: 20 °C |
| Flash Point | 38°C |
| Appearance | Quinone is a yellow, crystalline material or large yellow, monoclinic prisms. Pungent, irritating odor. |
| Color | Yellow to green |
| Odor | irritant odor |
| Form | Powder |
| Water Solubility | 10 g/L (25 ºC) |
| Vapor Pressure | 0.1 mm Hg ( 25 °C) |
| Refractive Index | n20/D 1.453 |
| pH | 4 (1g/l, H2O, 20℃) |
| Log P | 0.1-0.3 at 23℃ and pH4.8-5.3 |
Safety & Handling
Danger GHS06 GHS09 GHS07 GHS08 Hazard Statements H301 Toxic if swallowed H315 Causes skin irritation H317 May cause an allergic skin reaction H319 Causes serious eye irritation H331 Toxic if inhaled H335 May cause respiratory irritation H341 Suspected of causing genetic defects H370 Causes damage to organs H371 May cause damage to organs H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects H301+H331 Toxic if swallowed or if inhaled Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29146900 |
| UN Number | 2587 |
| ADR Class | 6.1 |
| Packing Group | II |
| Storage Class | 4.1B - Flammable solid hazardous materials |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 106-51-4
- EC Number
- 203-405-2
- Mol. Weight
- 108.09
- HS Code
- 29146900
- Category
- Catalysts & Catalyst Precursors