Diethyl cyclopentane-1,1-dicarboxylate is primarily used as an intermediate in organic synthesis, particularly in the production of fine chemicals and pharmaceuticals. It serves as a key building block for the development of complex molecules due to its versatile reactivity. The compound is often employed in cyclization and condensation reactions, which are essential steps in creating cyclic structures found in many bioactive compounds. Additionally, it is utilized in the synthesis of agrochemicals, where it contributes to the formation of active ingredients in pesticides and herbicides. Its ester groups make it a valuable reagent in esterification and transesterification processes, enabling the modification of chemical structures to achieve desired properties.