Used primarily as an intermediate in organic synthesis, especially in the pharmaceutical industry for the preparation of active pharmaceutical ingredients. It reacts readily with amines to form amides, making it valuable in constructing peptide-like structures or drug scaffolds. Also employed in the synthesis of fragrances and flavoring agents due to its aromatic and ester-forming properties. Its reactivity allows for easy incorporation into more complex molecules, particularly in the development of anti-inflammatory and central nervous system agents. Commonly used in acylation reactions where a phenylpropionyl group needs to be introduced. As an acid chloride, it is highly reactive to moisture and should be handled in a dry, controlled environment.