Used primarily as an intermediate and alkylating agent in organic synthesis, especially in the production of pharmaceuticals, agrochemicals, and other fine chemicals. It facilitates the introduction of chloroethyl groups into molecules and is also employed as a solvent in reactions requiring anhydrous conditions, as well as in the preparation of specialty polymers, resins, and functionalized solvents. Due to its high reactivity, toxicity, and potential carcinogenic properties, its use is strictly limited and requires careful handling in controlled environments with proper ventilation and safety measures.