3,5-Diethynylbenzoic acid is primarily utilized in the synthesis of advanced organic materials, particularly in the development of conjugated polymers and molecular frameworks. Its ethynyl groups make it a valuable building block for creating highly stable and conductive polymers, which are essential in organic electronics, such as organic light-emitting diodes (OLEDs) and organic photovoltaics (OPVs). Additionally, it serves as a precursor in the construction of metal-organic frameworks (MOFs), where its rigid structure and functional groups enhance the material's porosity and stability, making it suitable for gas storage, separation, and catalysis applications. Its versatility also extends to the field of supramolecular chemistry, where it is used to design complex molecular architectures with tailored properties.