2,5-Dichloroaniline
A dichlorinated aniline, supplied as 2,5-dichloroaniline for use as a diazo component across dye intermediate manufacture.
What is 2,5-Dichloroaniline?
2,5-Dichloroaniline is a white to tan crystalline solid built on a benzene ring carrying an amino group at C-1 and chlorine substituents at C-2 and C-5.
That arrangement is the reason the molecule is valuable as a diazo component. The amino group is diazotized to a diazonium salt, which is then coupled to a partner component, and the position of the two chlorine atoms on the ring controls where that coupling lands and how the resulting azo chromophore behaves — its shade, its crystal form, and its fastness once it's built into a finished dye or pigment.
At Chelora Dyes, 2,5-Dichloroaniline is crystallised and dried to a controlled particle profile and low moisture, so diazotization and coupling reactions downstream run cleanly and give a consistent, reproducible shade batch to batch.
- Appearance
- White to tan crystalline
- Odour
- Faint, amine-like
- Solubility
- Dilute acids, alcohol, benzene
- Function
- Diazo component
- Grade
- Technical / dye
Dichlorinated aniline
- Molecular formulaC6H5Cl2N
- Molecular weight162.02 g/mol
- IUPAC name2,5-Dichloroaniline
- Functional groupsAmine, two aryl chloride
- CAS number95-82-9
Technical product information
Standard specification for Chelora Dyes' technical grade 2,5-Dichloroaniline. Custom-grade and bulk specifications are available on request.
| Chemical name | 2,5-Dichloroaniline |
|---|---|
| Synonyms | 25DCA |
| CAS number | 95-82-9 |
| Molecular formula | C6H5Cl2N |
| Molecular weight | 162.02 g/mol |
| Assay (purity) | ≥ 98.0% |
| Appearance | White to tan crystalline solid |
| Melting point | 48–51°C |
| Moisture content | ≤ 0.5% |
| Insoluble matter | ≤ 0.2% |
| Solubility | Slightly soluble in water; soluble in dilute acids, alcohol and benzene |
| Packaging | 25 kg / 50 kg bags, 500–1000 kg jumbo bags |
| Shelf life | 24 months in sealed original packaging |
Applications of 2,5-Dichloroaniline
Azo dye synthesis
Diazotized and coupled to build azo dyes used in textile dyeing and printing ink formulation.
Azo pigment synthesis
Serves as a diazo component in the manufacture of chlorinated azo pigments.
Pigment dispersions
Feeds into pigment intermediates used in masterbatch, coatings and printing ink formulation.
Fine chemical intermediates
Supplies a dichlorinated aniline core for further condensation chemistry.
Agrochemical intermediates
Used in smaller volumes as a building block toward specialty agrochemical intermediates.
Analytical reagents
Used as a reference and diazotization reagent in analytical and research-scale dye chemistry.
Why choose Chelora Dyes
Consistent purity
Assay controlled at ≥98% with moisture and colour verified before dispatch.
Full documentation
COA, SDS, and regulatory data supplied with every shipment.
Flexible volumes
From 25 kg bags to jumbo-bag bulk quantities.
Technical support
Process, diazotization, and compliance guidance from our chemistry team.
Storage and guidelines
- Store in tightly sealed original packaging in a dry environment.
- Keep in a cool, dry, well-ventilated area away from direct sunlight and heat.
- Protect from air exposure to limit surface discolouration.
- Segregate from strong oxidising agents and strong acids.
- Use compatible containers: lined HDPE bags or drums.
- Re-seal bags promptly after use to preserve assay specification.
Handling precautions
2,5-Dichloroaniline is an irritant to skin, eyes and the respiratory tract and is harmful to aquatic life; contact and environmental release should be avoided.
Use dust control measures, chemically resistant gloves, and eye protection during weighing, charging, and any bulk handling operation.
Provide local exhaust ventilation where dust generation is likely, and avoid breathing dust or vapour.
Refer to the full Safety Data Sheet for exposure limits, spill containment, disposal, and first-aid measures before use.
Frequently asked questions
What is 2,5-Dichloroaniline used for?
2,5-Dichloroaniline is diazotized and used as a diazo component in the manufacture of azo dyes and pigments, where the two chlorine substituents help set the shade, fastness and crystal form of the finished colourant.
How does 2,5-Dichloroaniline compare with other dichloroaniline isomers?
It differs from 3,4-dichloroaniline and other isomers only in the relative position of the two chlorine atoms on the ring, but that positioning changes the shade, solubility and crystallisation behaviour of the diazo intermediates and finished pigments derived from it.
Is 2,5-Dichloroaniline soluble in water?
It is only slightly soluble in water. It is more soluble in dilute mineral acids, where it is used in solution for diazotization, and dissolves readily in common organic solvents such as alcohol and benzene.
What purity do you supply?
Standard technical grade is supplied at a minimum assay of 98%, with moisture and colour held within tight limits to ensure consistent diazotization and downstream pigment shade.
What packaging sizes are available?
25 kg and 50 kg multiwall paper or HDPE-lined bags, with bulk supply available in 500 kg and 1000 kg jumbo bags.
How should it be stored, and for how long?
In sealed original packaging in a cool, dry, ventilated store away from strong oxidisers and acids. Shelf life is 24 months from manufacture when storage conditions are maintained.
Is it hazardous to handle?
It is an irritant with aquatic toxicity considerations and should be handled with standard PPE, dust control and adequate ventilation. Review the Safety Data Sheet before any handling operation.
Do you provide a Certificate of Analysis?
Yes. Each batch ships with a Certificate of Analysis and Safety Data Sheet covering assay, moisture, appearance and melting point.
