Ammonium phenyl acetate is primarily used in organic synthesis as a reagent or intermediate. It plays a role in the preparation of various aromatic compounds, particularly in pharmaceutical research, where it aids in the development of active pharmaceutical ingredients (APIs). Additionally, it is utilized in the production of fragrances and flavoring agents, contributing to the synthesis of compounds with specific aromatic properties. In analytical chemistry, it can serve as a standard or reference material for calibration purposes. Its applications also extend to the field of biochemistry, where it may be used in studies involving amino acid derivatives or peptide synthesis.