Used as an intermediate in the synthesis of pharmaceuticals and fine chemicals, particularly in the development of active pharmaceutical ingredients (APIs) where aromatic ester and amide linkages are required. Its reactive acid chloride group allows for easy coupling with amines or alcohols, making it valuable in constructing complex organic molecules. Commonly employed in research settings for derivatization and protection group strategies in multi-step organic synthesis. Also finds use in the preparation of specialty polymers and agrochemicals due to its ability to introduce diethoxy-substituted aromatic moieties.