Used as an intermediate in organic synthesis, particularly in the pharmaceutical industry for constructing complex molecules. It serves as a protected form of phenylacetic acid derivatives, enabling selective reactions in multi-step syntheses. Commonly employed in the development of active pharmaceutical ingredients (APIs) where the methoxyphenyl group is part of the target structure. Its tert-butyl ester group allows for easy deprotection under mild acidic conditions, making it valuable in peptide and heterocyclic chemistry. Also utilized in the preparation of fragrances and fine chemicals due to its stability and reactivity profile.