(E)-3-(3-Methoxyphenyl)acrylic acid is primarily utilized in the synthesis of organic compounds, particularly in the production of fine chemicals and pharmaceuticals. It serves as a key intermediate in the development of various biologically active molecules, including potential drug candidates. The compound is often employed in coupling reactions, such as Heck reactions, to create complex organic structures. Additionally, it is used in the preparation of polymers and coatings, where its conjugated system contributes to enhanced material properties. In research, it is valued for its role in studying structure-activity relationships in medicinal chemistry.