2,5-Dichlorophenol
A high-purity chlorinated phenol supplied as flakes for agrochemical, pharmaceutical, and dye intermediate synthesis, and for specialty ether and ester chemistry.
What is 2,5-Dichlorophenol?
2,5-Dichlorophenol — 25DCP — is a white to off-white crystalline solid with a sharp phenolic odour, carrying chlorine atoms at the 2 and 5 positions of a phenol ring.
The chlorines make the hydroxyl group markedly more acidic than in phenol itself, so 25DCP dissolves readily in dilute alkali and forms phenolate salts that alkylate and acylate cleanly. That reactivity is the basis of the aryloxy ether and ester intermediates built from it.
At Chelora Chemicals, 25DCP is crystallised and flaked with isomer content, melting range, and moisture held to specification, giving downstream users consistent conversion in etherification, condensation, and coupling steps.
- Appearance
- White to off-white crystalline flakes
- Odour
- Sharp, phenolic
- Solubility
- Slightly soluble in water; soluble in alcohol, ether, dilute alkali
- Function
- Chemical intermediate
- Grade
- Technical
Formula diagram
Phenol ring chlorinated at the 2 and 5 positions
- Molecular formulaC6H4Cl2O
- Molecular weight163.00 g/mol
- IUPAC name2,5-Dichlorophenol
- Functional groupsPhenol, aryl chloride
- CAS number583-78-8
Technical product information
Standard specification for Chelora Chemicals' technical grade 2,5-Dichlorophenol. Custom-grade and bulk specifications are available on request.
| Chemical name | 2,5-Dichlorophenol |
|---|---|
| Synonyms | 25DCP, 2,5-DCP, 1-Hydroxy-2,5-dichlorobenzene |
| CAS number | 583-78-8 |
| Molecular formula | C6H4Cl2O |
| Molecular weight | 163.00 g/mol |
| Assay (purity) | ≥ 99.0% |
| Appearance | White to off-white crystalline flakes |
| Melting point | 56–58°C |
| Boiling point | 211°C |
| Flash point | > 100°C (closed cup) |
| Isomer content | ≤ 0.5% |
| Moisture | ≤ 0.3% |
| Packaging | 25 kg bags, 500 kg jumbo bags, molten tanker |
| Shelf life | 24 months from date of manufacture |
Applications of 2,5-Dichlorophenol
Agrochemical intermediates
Converted into aryloxy ethers and esters used in herbicide and fungicide synthesis.
Pharmaceutical intermediates
Provides a chlorinated phenolic core for API and development compound synthesis.
Dyes & pigments
Used as a coupling component and precursor in chlorinated dye intermediate chemistry.
Antiseptic & biocide intermediates
Feeds the synthesis of chlorinated phenolic actives used in disinfectant formulations.
Specialty ethers & esters
Alkylated or acylated through its phenolate salt to build aryloxy intermediates.
Analytical standards
Supplied as a reference material for chlorophenol testing in environmental and water analysis.
Why choose Chelora Chemicals
Every batch of 2,5-Dichlorophenol is manufactured, tested, and documented to a standard that formulators and process chemists can build on with confidence — from first sample to full production volume.
Consistent purity
Assay controlled at ≥99% with isomer content and melting range verified before dispatch.
Full documentation
COA, SDS, and regulatory data supplied with every shipment.
Flexible volumes
From 25 kg bags to jumbo bags and molten tanker supply.
Technical support
Process, handling, and compliance guidance from our chemistry team.
Storage and guidelines
- 01Store in tightly closed original packaging in a cool, dry, well-ventilated store.
- 02Keep below 30°C — the product softens and cakes as it approaches its melting range.
- 03Keep away from heat, ignition sources, and direct sunlight.
- 04Segregate from strong oxidising agents, strong bases, and food or feed materials.
- 05Use compatible containers: lined steel, stainless steel, glass, or HDPE.
- 06Prevent any release to drains, surface water, or soil — chlorophenols are very toxic to aquatic life.
Handling precautions
25DCP is toxic if swallowed, in contact with skin, or if inhaled, and causes severe skin burns and eye damage. It is for industrial use by trained personnel only.
Chlorophenols are readily absorbed through intact skin, and absorption through a burn or abrasion can be rapid. Chemical-resistant gloves, coveralls, face protection, and respiratory protection are required.
Control dust during bag emptying and charging, and use local exhaust ventilation at all transfer and melting points.
The product is very toxic to aquatic organisms with long-lasting effects and imparts taste and odour to water at extremely low concentrations. Contain all spills and dispose of waste through licensed routes.
Ensure emergency showers and eyewash stations are available and functional at every handling point. Refer to the full Safety Data Sheet before use.
Frequently asked questions
What is 2,5-Dichlorophenol used for?
It is an intermediate for agrochemical, pharmaceutical, and dye synthesis, typically through etherification or acylation of the phenolic hydroxyl. It is also used as an analytical reference standard for chlorophenol testing.
Why are chlorophenols more acidic than phenol?
The chlorine atoms withdraw electron density from the ring and stabilise the negative charge on the phenolate ion once the hydroxyl proton is lost. That is why 25DCP dissolves readily in dilute caustic and forms salts that alkylate cleanly.
How does 2,5-DCP differ from 2,4-DCP?
They share the formula C6H4Cl2O but place the second chlorine differently. 2,4-DCP is produced in very large volume for phenoxy herbicides, while 2,5-DCP serves narrower pharmaceutical, dye, and specialty routes. They are not interchangeable.
Is it soluble in water?
Only slightly in neutral water, but it dissolves readily in dilute sodium hydroxide as the phenolate salt, and in alcohols, ether, and acetone. Alkaline dissolution is the usual route into further chemistry.
Why does the flake cake in the bag?
The melting point is only 56–58°C, so warm storage or transport softens the flakes and causes fusing. Keeping the store below 30°C, palletised and out of direct sun, prevents most caking without affecting assay.
Can it be supplied molten?
Yes, for bulk users. Molten supply in heated tankers avoids dust exposure and handling losses, but the receiving site needs dedicated heated lines, temperature control, and vapour extraction.
What purity do you supply?
Standard technical grade is supplied at a minimum assay of 99% with isomer content at or below 0.5% and moisture at or below 0.3%. Tighter specifications can be manufactured to order.
Why is the odour threshold relevant?
Chlorophenols are detectable by taste and smell in water at extremely low concentrations, far below any toxic level. This makes even minor releases a serious environmental and public-nuisance issue, so containment is essential.
What packaging sizes are available?
25 kg bags, 500 kg jumbo bags, and molten product in heated tankers. Samples are available for trial and qualification work.
Is 2,5-Dichlorophenol hazardous?
Yes. It is acutely toxic by several routes, corrosive to skin and eyes, skin-absorbable, and very toxic to aquatic life with long-lasting effects. Trained personnel, containment, and full PPE are required per the Safety Data Sheet.
Do you provide a Certificate of Analysis?
Yes. Every batch is dispatched with a Certificate of Analysis and Safety Data Sheet covering assay, isomer content, melting range, moisture, and appearance.