Used primarily as an intermediate in organic synthesis, especially in the production of pharmaceuticals and agrochemicals. Its reactive chloride group allows for easy substitution, making it valuable in forming C-C and C-heteroatom bonds. Commonly employed in the synthesis of active pharmaceutical ingredients (APIs) where the 4-ethylbenzyl moiety is part of the target molecule. Also utilized in the preparation of specialty chemicals such as fragrances and functional polymers due to its stability and reactivity profile.