Used primarily as a chemical intermediate in organic synthesis, particularly in the preparation of heterocyclic compounds and pharmaceuticals. It acts as a chloroformylating agent, introducing the chloroethyl carbonate group into molecules. Commonly employed in the synthesis of beta-blockers and other bioactive compounds. Also utilized in the production of pesticides and agrochemicals due to its reactivity with amines and alcohols. Requires careful handling due to high toxicity and lachrymatory effects.