3-chloro-4-methylbenzenesulfonyl chloride

3-chloro-4-methylbenzenesulfonyl chloride is an organic chemical compound with the molecular formula C7H6Cl2O2S and CAS number 42413-03-6. This aromatic sulfonyl chloride derivative has a molecular weight of 225.09 g/mol and belongs to the class of substituted benzenesulfonyl chlorides. It features both chloro and methyl substituents on the benzene ring, making it a valuable intermediate in organic synthesis and pharmaceutical chemistry.

3-chloro-4-methylbenzenesulfonyl chloride is typically a solid at room temperature with characteristic properties of sulfonyl chlorides. As a reactive organic compound, it is moisture-sensitive and tends to hydrolyze in the presence of water, releasing hydrogen chloride gas. The compound is generally soluble in organic solvents such as dichloromethane, chloroform, and aromatic solvents, but reacts with protic solvents including alcohols and water.

3-chloro-4-methylbenzenesulfonyl chloride is primarily used as a synthetic intermediate in pharmaceutical and fine chemical manufacturing. It serves as an important building block for the synthesis of sulfonamide derivatives, pharmaceutical active ingredients, and agrochemical compounds. The compound is also utilized in organic synthesis for introducing sulfonyl groups into target molecules and as a reagent in medicinal chemistry research for drug development applications.

3-chloro-4-methylbenzenesulfonyl chloride requires careful handling due to its corrosive nature (Skin Corr. 1B) and sensitizing properties (Skin Sens. 1). Essential personal protective equipment includes chemical-resistant gloves, safety goggles, and protective clothing. Work must be conducted in a well-ventilated area or under a fume hood to prevent inhalation. Avoid contact with skin, eyes, and clothing, and ensure immediate access to emergency eyewash and shower facilities.

3-chloro-4-methylbenzenesulfonyl chloride must be stored in a cool, dry place away from moisture and heat sources due to its hydrolytic instability. Keep containers tightly sealed to prevent exposure to atmospheric humidity. Store away from incompatible materials such as water, alcohols, amines, and strong bases. Use corrosion-resistant containers and ensure adequate ventilation in storage areas. Maintain temperatures below 25°C and protect from direct sunlight to preserve product integrity.

Immediate action is crucial due to the corrosive nature of 3-chloro-4-methylbenzenesulfonyl chloride. For skin contact, immediately remove contaminated clothing and flush affected area with copious amounts of water for at least 15 minutes. In case of eye contact, rinse immediately with water for at least 15 minutes and seek medical attention. If inhaled, move to fresh air immediately. For ingestion, do not induce vomiting and seek immediate medical attention. Always consult emergency services for serious exposures.

3-chloro-4-methylbenzenesulfonyl chloride waste must be disposed of according to local and national hazardous waste regulations as it is classified as corrosive waste. Do not pour down drains or release into the environment due to its aquatic toxicity classification (Aquatic Chronic 3). Contact licensed hazardous waste disposal companies for proper treatment and disposal. Small quantities may require neutralization under controlled conditions before disposal, but this should only be performed by trained professionals following appropriate safety protocols.

3-chloro-4-methylbenzenesulfonyl chloride is classified as dangerous goods under ADR regulations with Class 8 (corrosive substances) and Packing Group II. Transportation requires appropriate UN-specification packaging, proper labeling with corrosive hazard labels, and accompanying transport documents. Vehicles must carry appropriate emergency equipment and drivers need ADR training. Shipments must comply with quantity limitations and routing restrictions as specified in ADR regulations for Class 8 substances.

3-chloro-4-methylbenzenesulfonyl chloride is subject to standard EU chemical regulations including REACH and CLP, but is not classified as a Substance of Very High Concern (SVHC). It must comply with classification, labeling, and packaging requirements under CLP regulation, displaying appropriate hazard pictograms (GHS05, GHS07) and the danger signal word. Users must follow occupational exposure limits and safety data sheet requirements. The substance may also be subject to specific national regulations regarding handling and use.

3-chloro-4-methylbenzenesulfonyl chloride is available through OYSI, a specialized European distributor of technical chemicals and pharmaceutical intermediates. OYSI provides this compound to pharmaceutical manufacturers, research institutions, and fine chemical companies across Europe. The company ensures proper packaging, documentation, and regulatory compliance for safe delivery. Contact OYSI directly for availability, specifications, and technical support to meet your specific application requirements in pharmaceutical synthesis or chemical research.