5,5'-(Ethane-1,2-diyl)diisophthalic acid is a specialty chemical utilized in the synthesis of advanced materials. It serves as a key intermediate in producing high-performance polymers, such as polyamides and polyesters, which offer excellent thermal resistance and mechanical strength. These polymers are widely used in synthetic fibers, specialty films, and electronic components. Additionally, its rigid structure acts as a versatile linker in the development of metal-organic frameworks (MOFs), enabling the formation of stable, porous structures with metal ions. MOFs derived from this compound are applied in gas storage (e.g., hydrogen or carbon dioxide), catalysis for efficient chemical reactions, and separation processes through selective molecular adsorption, leveraging their high surface area and tunable pore sizes.