Used as an intermediate in organic synthesis, particularly in the preparation of pharmaceuticals and fine chemicals. It serves as an alkylating agent due to the reactive bromine atom, enabling the introduction of a 4-phenylbutyl group into various substrates. Commonly employed in the synthesis of active pharmaceutical ingredients where a phenylalkyl chain is required. Also utilized in the production of agrochemicals and specialty polymers. Its reactivity makes it valuable in forming carbon-carbon bonds through coupling reactions.