Used primarily as an intermediate in organic synthesis, it plays a crucial role in the production of dyes, pharmaceuticals, and agrochemicals. Its sulfonyl chloride group is reactive, making it valuable for creating sulfonamides, which are key components in many antibacterial drugs. Additionally, it is utilized in the preparation of sulfonated polymers and resins, contributing to materials with enhanced properties like durability and chemical resistance. In research, it serves as a reagent for modifying peptides and proteins, aiding in the study of biochemical processes.