Used as an intermediate in organic synthesis, particularly in the production of pharmaceuticals, agrochemicals, and dyes. It participates in esterification and alkylation reactions due to its reactive chloro and ester functional groups. Commonly employed in the preparation of carboxylic acid derivatives and as a methylating agent in fine chemical manufacturing. Also utilized in the synthesis of plant growth regulators and certain herbicides. Requires careful handling due to high reactivity and toxicity.