Chloromethyl chlorosulfate is primarily used as a chemical intermediate in organic synthesis. It is employed in the production of various sulfonated compounds, which are essential in the manufacture of dyes, pharmaceuticals, and agrochemicals. Additionally, it serves as a reagent in the introduction of the chloromethyl group into organic molecules, a key step in the synthesis of certain polymers and resins. Its reactivity makes it valuable in specialized chemical reactions where precise functional group transformations are required. Due to its hazardous nature, handling requires strict safety protocols to prevent exposure and ensure controlled use in industrial processes.