Used as an alkylating agent in organic synthesis, particularly in the preparation of heterocyclic compounds and pharmaceutical intermediates. It serves as a key reagent in the formation of quaternary ammonium salts and in the synthesis of choline esters. Its reactivity allows for the introduction of bromoethyl groups into molecules, facilitating the development of active pharmaceutical ingredients and agrochemicals. Commonly employed in research settings for constructing complex molecular frameworks due to its ability to participate in substitution and cyclization reactions.