Overview
Benzenesulfonyl chloride (CAS 98-09-9 ), also known as phenylsulfonyl chloride, is a reactive sulfonylating agent used across pharmaceutical synthesis, dye manufacturing, and specialty chemical production.
It introduces sulfonyl groups into organic molecules, enabling the construction of intermediates that would otherwise require multiple synthetic steps. In pharmaceutical manufacturing, it serves as a key building block.
This chemical is essential for synthesizing sulfonamide drugs, protecting groups, and active pharmaceutical intermediates requiring controlled sulfonylation. Dye and pigment producers use it to manufacture azo dyes.
These reactive dyes are widely applied in textile and leather finishing. Water treatment chemical formulators incorporate sulfonyl chloride-derived compounds as biocidal actives targeting microbial control.
These applications are critical for industrial water systems. Paper processing operations also draw on sulfonyl-based chemistry for surface treatment agents that improve wet strength and resistance properties.
The product is supplied as a colorless to pale yellow liquid in standard drum and IBC packaging suited to bulk industrial procurement. It is available in technical grade and high-purity grades.
These grades meet pharmaceutical intermediate specifications, with purity typically confirmed by GC analysis. Buyers should confirm moisture-controlled packaging requirements with suppliers for safety.
The product is sensitive to hydrolysis during storage and transit. Proper handling ensures the material maintains its chemical integrity for use in sensitive manufacturing and synthesis processes.
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Physical Properties
| Melting Point | 14.5 °C |
| Boiling Point | 120 °C @ Press: 10 Torr |
| Density | 1.3842 g/cm³ @ Temp: 15 °C |
| Flash Point | >230 °F |
| Appearance | Benzenesulfonyl chloride is a colorless oily liquid with a pungent odor. |
| Color | Clear |
| Form | Liquid |
| Water Solubility | may decompose |
| Vapor Pressure | 0.04 mm Hg ( 20 °C) |
| Refractive Index | n 20/D 1.551(lit.) |
| Log P | 3.39 at 23℃ |
Safety & Handling
Danger GHS05 GHS07 GHS08 Hazard Statements H302 Harmful if swallowed H314 Causes severe skin burns and eye damage H317 May cause an allergic skin reaction H318 Causes serious eye damage H319 Causes serious eye irritation H332 Harmful if inhaled H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled H371 May cause damage to organs Precautionary Statements P233 Keep container tightly closed. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 In case of inadequate ventilation wear respiratory protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P321 Specific treatment (see … on this label). P330 Rinse mouth. P363 Wash contaminated clothing before reuse. P403 Store in a well-ventilated place. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P342+P316 Get emergency medical help immediately. P362+P364 Take off contaminated clothing and wash it before reuse. P301+P330+P331 Rinse mouth. Do NOT induce vomiting. P302+P361+P354 IF ON SKIN: Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29049090 |
| UN Number | 2225 |
| ADR Class | 8 |
| Packing Group | III |
| Storage Class | 8A - Combustible corrosive hazardous materials |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 98-09-9
- EC Number
- 202-636-6
- Mol. Weight
- 176.62
- HS Code
- 29049090
- Category
- Pigments & Colorants