3,5-Dichlorobenzenesulfonyl chloride
3,5-Dichlorobenzenesulfonyl chloride (CAS: 705-21-5) is an organosulfur compound with the linear formula Cl2C6H3SO2Cl and a molecular weight of 245.51 g/mol. This reactive sulfonyl chloride serves as a valuable building block in organic synthesis. It is primarily utilised in the chemical industry for the preparation of various organic intermediates and specialised compounds.
- Synonyms
- Cl2C6H3SO2Cl

Organic Synthesis Reagent
Utilised as a key intermediate in the synthesis of complex organic molecules. Its reactive sulfonyl chloride group readily participates in reactions with nucleophiles.
Building Block for Pharmaceuticals
Serves as a foundational component in the development pathways for potential pharmaceutical agents. The dichloro-substituted benzene ring offers specific structural characteristics.
Chemical Research
Employed in academic and industrial research laboratories for the exploration of new chemical entities and reaction methodologies.
| Molecular weight | 245.51 |
|---|---|
| Linear formula | Cl2C6H3SO2Cl |
| Assay | 97% |
| Melting point | 32-35 °C(lit.) |

Hazard statements
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 1759 8 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | C |
| Risk statements (R) | 34 |
| Safety statements (S) | 26-36/37/39-45 |
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 3,5-Dichlorobenzenesulfonyl chloride used for?
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3,5-Dichlorobenzenesulfonyl chloride is primarily used as a building block and reagent in organic synthesis for the preparation of various chemical intermediates and organic compounds.
What is the CAS number and formula for 3,5-Dichlorobenzenesulfonyl chloride?
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The CAS number is 705-21-5 and the linear formula is Cl2C6H3SO2Cl.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3,5-Dichlorobenzenesulfonyl chloride with a minimum assay of 97%. We do not represent this product as USP, BP, or EP grade.
How should 3,5-Dichlorobenzenesulfonyl chloride be handled?
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This compound is classified as Danger, causing severe skin burns and eye damage (H314). Handling requires appropriate personal protective equipment, including eyeshields, face shields, gloves, and a suitable respirator. Ensure adequate ventilation.
Is 3,5-Dichlorobenzenesulfonyl chloride packed and shipped internationally?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 3,5-Dichlorobenzenesulfonyl chloride, adhering to international shipping regulations (UN 1759, Class 8, Packing Group II).
How can I request a sample or quote for 3,5-Dichlorobenzenesulfonyl chloride?
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Please contact our sales department via the website or direct inquiry to request a sample or obtain a quotation for 3,5-Dichlorobenzenesulfonyl chloride.
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