CAS Number: 98-59-9 Chinese Name: p-Toluenesulfonyl chloride English Name: Tosyl chloride Aliases: 4-Methylbenzenesulfonyl chloride; p-Toluenesulfonyl chloride; p-Chlorotoluene sulfone; Toluene-4-sulfonyl chloride; p-Tolylsulfonyl chloride; PTSC Purity: 99% Molecular Formula: C7H7ClO2S Molecular Weight: 190.64 EINECS Number: 202-684-8 Package: 25kg/drum Specification: Appearance: White crystalline powder Melting Point: 66.5°C – 69°C Purity: ≥99% Free Acid: ≤0.3% Loss on Drying: ≤0.3% Heavy Metals: ≤0.002% Usage: Used as an analytical reagent, in organic synthesis, dye preparation, and molecular rearrangement reactions in hormone synthesis. Physical Properties: Appearance: White rhombic crystals with a pungent odor Solubility: Insoluble in water, soluble in alcohol, ether, and benzene