Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of sulfa-based drugs. It serves in creating carbon-sulfur bonds for functionalized aromatic compounds with biological activity. Commonly applied in medicinal chemistry for modifying molecular frameworks to enhance drug efficacy or metabolic stability. Also utilized in agrochemical research for designing bioactive molecules with selective action. Its chloro and sulfonamide groups allow further derivatization, making it valuable in building complex organic structures.