3-Chloro-4-fluorobenzenesulfonyl chloride
3-Chloro-4-fluorobenzenesulfonyl chloride (CAS: 91170-93-3) is a fluorinated organic building block with the linear formula C6H3ClFSO2Cl and a molecular weight of 229.06 g/mol. This compound serves as a valuable intermediate in organic synthesis, particularly in the development of pharmaceuticals and agrochemicals. Its reactivity as a sulfonyl chloride makes it useful for introducing the 3-chloro-4-fluorobenzenesulfonyl moiety into various molecules.

Pharmaceutical Intermediate
3-Chloro-4-fluorobenzenesulfonyl chloride is employed in the synthesis of active pharmaceutical ingredients (APIs). Its structure can be incorporated into drug candidates to modify their pharmacokinetic or pharmacodynamic properties.
Agrochemical Synthesis
This chemical acts as a building block for the creation of novel agrochemicals, including herbicides and pesticides. The introduction of fluorine and chlorine atoms can enhance biological activity and stability.
Organic Synthesis Reagent
As a functionalised sulfonyl chloride, it is used in various organic transformations to form sulfonamides, sulfonate esters, and other sulfur-containing compounds. These derivatives find applications across diverse chemical sectors.
| Molecular weight | 229.06 |
|---|---|
| Linear formula | C6H3ClFSO2Cl |
| Assay | 97% |
| Boiling point | 104-105 °C/1 mmHg(lit.) |
| Density | 1.610 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.552(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 | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 110 °C / 230 °F |
| Transport (UN / ADR) | UN 3265 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-Chloro-4-fluorobenzenesulfonyl chloride used for?
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3-Chloro-4-fluorobenzenesulfonyl chloride is primarily used as an intermediate in the synthesis of pharmaceuticals, agrochemicals, and other fine organic chemicals. It serves as a building block to introduce the 3-chloro-4-fluorobenzenesulfonyl group.
What is the CAS number and formula for 3-Chloro-4-fluorobenzenesulfonyl chloride?
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The CAS number is 91170-93-3 and the linear formula is C6H3ClFSO2Cl.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-Chloro-4-fluorobenzenesulfonyl chloride with a minimum assay of 97%. This product is supplied for research and development purposes and is not represented as USP, BP, EP, or other pharmacopoeia grades.
How should 3-Chloro-4-fluorobenzenesulfonyl chloride be handled safely?
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3-Chloro-4-fluorobenzenesulfonyl chloride is a corrosive substance (H314). Handle with extreme care, using full personal protective equipment including faceshields, goggles, chemical-resistant gloves, and appropriate respiratory protection. Ensure adequate ventilation and avoid contact with skin, eyes, and clothing. Refer to the Safety Data Sheet (SDS) for comprehensive handling information.
How is this product packed and shipped globally?
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Tech Serve Solutions packs and ships 3-Chloro-4-fluorobenzenesulfonyl chloride in compliance with international regulations for hazardous materials. As a corrosive solid (UN 3265, 8, PGII), it is securely packaged for safe transport and export worldwide.
How can I request a sample or quote for 3-Chloro-4-fluorobenzenesulfonyl chloride?
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To request a sample or a quotation for 3-Chloro-4-fluorobenzenesulfonyl chloride, please contact our sales department through the website or by calling our direct line. Please specify the quantity required and your delivery location.
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