Used primarily as an intermediate in organic synthesis, especially in the preparation of sulfonamide derivatives which are important in pharmaceutical and agrochemical industries. Its dual functionality allows for the introduction of the 4-chlorobutylsulfonyl group into target molecules: the sulfonyl chloride moiety reacts selectively with amines or hydroxyl groups to form sulfonamides or sulfonates, while the terminal chloro group enables subsequent nucleophilic substitution for further chain extension or conjugation. This enhances lipophilicity, modulates biological activity, and provides versatility in designing bifunctional molecules. Commonly employed in the development of active ingredients for herbicides and antimicrobial agents. Also utilized in research settings for modifying functional groups in complex molecule assembly due to its selective sulfonylation and alkylation capabilities.