Phenyl acetyl chloride is widely used in organic synthesis, particularly in the production of pharmaceuticals and fine chemicals. It serves as a key intermediate in the synthesis of penicillin and cephalosporin antibiotics, where it reacts with amino compounds to form amide bonds. Additionally, it is utilized in the preparation of fragrances and flavoring agents, contributing to the synthesis of compounds like phenylethyl alcohol, which is commonly found in perfumes. In the field of agrochemicals, it is employed to create herbicides and pesticides. Its reactivity with alcohols and amines also makes it valuable in polymer chemistry for modifying or cross-linking polymers.