Used primarily as an intermediate in organic synthesis, especially in the production of pharmaceuticals and agrochemicals. It participates in acylation reactions to introduce the 2-ethylbenzoyl group into target molecules. Commonly employed in the preparation of dyes, fragrances, and functional materials where an aromatic carbonyl moiety with a specific steric profile is required. Its reactivity makes it suitable for forming esters, amides, and ketones under controlled conditions. Handling requires caution due to its moisture sensitivity and potential to release hydrogen chloride.