2,5-Dichloro-p-phenylenediamine
2,5-Dichloro-p-phenylenediamine (CAS: 20103-09-7) is a chemical compound with the molecular formula Cl₂C₆H₂(NH₂)₂ and a molecular weight of 177.03 g/mol. This aromatic diamine serves as a valuable building block in various chemical synthesis processes, particularly in the fields of polymer science and materials science. It is typically supplied at an assay of 97% and requires storage at 2-8°C.
- IUPAC
- 1,4-Diamino-2,5-dichlorobenzene
- Synonyms
- 1,4-Diamino-2,5-dichlorobenzene2,5-Dichlorobenzene-1,4-diamine

Monomer for Polymer Synthesis
2,5-Dichloro-p-phenylenediamine can be employed as a monomer in the synthesis of specialized polymers. Its difunctional amine groups allow for participation in polymerization reactions, leading to materials with unique properties derived from the dichlorinated aromatic core.
Intermediate in Organic Synthesis
This compound functions as an intermediate in the preparation of more complex organic molecules. The presence of two amine groups and two chlorine atoms on the phenyl ring offers multiple sites for further chemical modification.
Materials Science Research
Its structural features make 2,5-Dichloro-p-phenylenediamine a candidate for research in materials science, potentially for developing new dyes, pigments, or functional materials.
| Molecular weight | 177.03 |
|---|---|
| Linear formula | Cl2C6H2(NH2)2 |
| Assay | 97% |
| Storage temperature | 2-8°C |
| Melting point | 164-166 °C (dec.)(lit.) |

Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-36/37/38 |
| Safety statements (S) | 26-36/37/39 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 2,5-Dichloro-p-phenylenediamine used for?
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2,5-Dichloro-p-phenylenediamine is used as a monomer in polymer synthesis, an intermediate in organic synthesis, and in materials science research.
What is the CAS number and formula for 2,5-Dichloro-p-phenylenediamine?
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The CAS number is 20103-09-7, and its linear formula is Cl₂C₆H₂(NH₂)₂.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 2,5-Dichloro-p-phenylenediamine at a purity of 97%. This is a technical/research grade material, and TSS does not represent it as USP, BP, or EP grade.
What are the primary safety concerns when handling 2,5-Dichloro-p-phenylenediamine?
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2,5-Dichloro-p-phenylenediamine is classified as harmful if swallowed, causes skin irritation, causes serious eye irritation, and may cause respiratory irritation (H302-H315-H319-H335). Appropriate personal protective equipment including a dust mask (type N95 US), eyeshields, and gloves should be used. Store in a well-ventilated place. Keep container tightly closed. Remove contaminated clothing and wash before reuse.
How is this chemical packed and exported by TSS?
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Tech Serve Solutions expertly packs and exports chemicals globally, adhering to all necessary regulations for safe transport.
How can I request a sample or quote for 2,5-Dichloro-p-phenylenediamine?
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To request a sample or quote, please contact our sales team through the website or by phone.
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