Used primarily as an intermediate in organic synthesis, particularly in the preparation of sulfonate esters and sulfonamides. It serves as a sulfonylating agent in pharmaceutical manufacturing, where it helps introduce the 4-butoxybenzenesulfonyl group to amines or alcohols. This modification can enhance the stability, solubility, or biological activity of drug candidates. It is also employed in the development of liquid crystals and agrochemicals due to its ability to form stable derivatives with tailored electronic and steric properties. Its reactivity makes it suitable for use in coupling reactions and the construction of complex molecules in research and industrial settings.