Used as an intermediate in organic synthesis, particularly in pharmaceutical and agrochemical industries. It serves as an alkylating agent due to the presence of the chloro and mesylate functional groups, enabling the introduction of the 2-chloroethyl moiety into target molecules. Commonly employed in the preparation of bioactive compounds, including potential drug candidates and functionalized aromatic derivatives. Its reactivity allows for facile substitution reactions under mild conditions, making it valuable in multi-step synthesis routes.