3-chloro-4-methylbenzenesulfonyl chloride

3-chloro-4-methylbenzenesulfonyl chloride is an organosulfur compound with the molecular formula C7H6Cl2O2S and CAS number 42413-03-6. This chemical belongs to the sulfonyl chloride family, characterized by the presence of both chlorine and methyl substituents on the benzene ring. With a molecular weight of 225.09 g/mol, it is classified as a corrosive and sensitizing substance requiring careful handling procedures.

3-chloro-4-methylbenzenesulfonyl chloride typically appears as a solid or liquid at room temperature, depending on purity and storage conditions. Like most sulfonyl chlorides, it is highly reactive with water and alcohols, hydrolyzing to form corresponding sulfonic acids. The compound is generally soluble in organic solvents but reacts vigorously with protic solvents, making anhydrous conditions essential for storage and handling.

3-chloro-4-methylbenzenesulfonyl chloride serves as an important intermediate in pharmaceutical and agrochemical synthesis. It is primarily used as a sulfonylating agent in organic chemistry reactions, particularly for introducing sulfonamide groups into target molecules. The compound finds applications in the production of active pharmaceutical ingredients, dyes, and specialty chemicals where selective sulfonylation reactions are required in industrial manufacturing processes.

3-chloro-4-methylbenzenesulfonyl chloride requires strict safety protocols due to its Skin Corr. 1B and Skin Sens. 1 classifications. Essential personal protective equipment includes chemical-resistant gloves, safety goggles, and protective clothing. Work must be conducted in well-ventilated areas or under fume hoods to prevent inhalation exposure. Avoid contact with water, alcohols, and other protic substances as violent reactions may occur, generating hazardous vapors.

3-chloro-4-methylbenzenesulfonyl chloride must be stored in tightly sealed containers under anhydrous conditions to prevent hydrolysis. Storage areas should be cool, dry, and well-ventilated, away from incompatible materials such as water, alcohols, amines, and strong bases. Containers should be made of chemically resistant materials, and storage locations must be equipped with appropriate spill containment measures and emergency equipment for handling potential leaks.

Immediate action is critical due to the corrosive nature of 3-chloro-4-methylbenzenesulfonyl chloride. For skin contact, remove contaminated clothing immediately and rinse affected areas with copious amounts of water for at least 15 minutes. In case of eye contact, flush with water continuously and seek immediate medical attention. If inhaled, move the person to fresh air and provide respiratory support if needed. Always consult emergency services for serious exposures.

3-chloro-4-methylbenzenesulfonyl chloride disposal must comply with local and national hazardous waste regulations as it is classified under multiple danger categories. The substance should never be discharged into sewers, water bodies, or regular waste streams due to its Aquatic Chronic 3 classification. Professional hazardous waste disposal services must be engaged, and the waste should be properly labeled, containerized, and documented according to applicable environmental protection requirements.

3-chloro-4-methylbenzenesulfonyl chloride is classified as ADR Class 8 (corrosive substances), Packing Group II, requiring specialized transport procedures. Packages must meet UN specification requirements for corrosive materials and bear appropriate hazard labels and markings. Transport vehicles must carry emergency equipment, and drivers require ADR training certification. Proper shipping documentation, including safety data sheets and emergency response information, must accompany all shipments.

3-chloro-4-methylbenzenesulfonyl chloride is subject to comprehensive chemical regulations including REACH registration requirements in Europe and CLP classification obligations. While not currently listed as an SVHC substance, it must comply with standard industrial chemical regulations due to its corrosive and sensitizing properties. Users must maintain safety data sheets, implement appropriate risk management measures, and ensure compliance with workplace exposure limits and environmental protection standards.

3-chloro-4-methylbenzenesulfonyl chloride is available through OYSI, a specialized European distributor of technical chemicals and pharmaceutical intermediates. OYSI provides reliable supply chains for industrial customers requiring this sulfonyl chloride for manufacturing applications. As a professional chemical distributor, OYSI ensures proper handling, documentation, and regulatory compliance for all shipments throughout Europe, supporting customers with technical expertise and reliable logistics services.