Used primarily as an intermediate in organic synthesis, especially in the preparation of sulfonamide derivatives which are important in pharmaceuticals and agrochemicals. It serves as a sulfonylating agent to introduce the 2-methoxybenzenesulfonyl group, aiding in the development of bioactive molecules. Its reactivity makes it valuable in forming C–N and C–O bonds during drug synthesis. Also utilized in the production of dyes and functional materials where controlled sulfonation is required. Due to its sensitivity to moisture, it is handled under anhydrous conditions in industrial and laboratory settings.