Used primarily as an intermediate in organic synthesis, particularly in the pharmaceutical and agrochemical industries. It serves as a sulfonylating agent to introduce the 5-methyl-2-nitrobenzenesulfonyl group into molecules, aiding in the protection of amines or modification of reactivity during multi-step syntheses. Its electron-withdrawing nitro group enhances the electrophilicity of the sulfonyl chloride, making it effective in forming sulfonamides, which are key structural motifs in certain bioactive compounds. Also employed in the development of dyes and functional materials where nitroaromatics contribute to desired electronic or optical properties.