1,2,4,5-Tetrakis(2-phenylethynyl)benzene (CAS 25634-84-8) has a molecular formula of C??H?? and a molecular weight of 504.61 g/mol, with four phenylethynyl (-C??C-C?H?) groups at the 1,2,4,5 positions of the central benzene ring. As a symmetric ??-conjugated aromatic compound, it is widely used in synthesizing organic semiconductors and advanced materials (e.g., OLEDs, liquid crystals) for its excellent charge-transport properties. It should be stored sealed under cool, dry, dark conditions to prevent oxidation, maintaining its structural and electronic integrity for optoelectronic applications.