Dimethyl 4-acetoxyisophthalate is primarily used in the synthesis of advanced polymers and resins. Its application is significant in the production of high-performance materials, such as liquid crystal polymers (LCPs), which are essential in the electronics industry for manufacturing components like connectors, circuit boards, and optical devices due to their excellent thermal stability and mechanical strength. Additionally, it serves as a key intermediate in organic synthesis, particularly in the development of specialty chemicals and pharmaceuticals, where its unique structure allows for the creation of complex molecules with specific functionalities.