2-Phenylglutaric anhydride is primarily utilized in organic synthesis as a versatile intermediate. It is commonly employed in the production of pharmaceuticals, particularly in the synthesis of active pharmaceutical ingredients (APIs) that require complex cyclic structures. Its anhydride functionality makes it a valuable building block for creating esters, amides, and other derivatives, which are essential in drug development. Additionally, it finds application in polymer chemistry, where it is used to modify or enhance the properties of polymeric materials, such as improving thermal stability or introducing specific functional groups. Its role in research and development also extends to the creation of novel compounds for various industrial and scientific purposes.