Used primarily as an intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. It is employed in the acylation reactions to introduce the 4-ethylbenzoyl group into target molecules, enhancing their chemical properties. Additionally, it serves as a key reagent in the development of dyes, pigments, and specialty chemicals, where its reactivity with amines and alcohols is utilized to form amides and esters, respectively. Its application is also seen in research laboratories for the preparation of complex organic compounds.