Used primarily as an intermediate in organic synthesis, especially in the pharmaceutical industry. It serves as a sulfonylating agent to introduce sulfonyl groups into various compounds, aiding in the development of active pharmaceutical ingredients. Commonly applied in the preparation of sulfonamides, which are key structures in many drugs, including antibiotics and antivirals. Also utilized in agrochemical synthesis for creating herbicides and pesticides. Its reactivity allows for efficient bond formation with amines and alcohols, making it valuable in building complex molecules.