Used primarily as a chemical intermediate in organic synthesis, particularly in the preparation of sulfone and sulfoxide derivatives. It serves as a methylating agent in specialized reactions where selective sulfur-based functionalization is required. Commonly employed in research settings for modifying sulfonamide compounds and developing novel sulfurous agents for agrochemicals and pharmaceuticals. Its reactivity makes it valuable in the synthesis of certain biologically active molecules, especially in the development of herbicides and plant growth regulators. Handle with care due to its potential lachrymatory and irritant properties.