4,4′-Diacetylbiphenyl (CAS 2673-23-6), a symmetric diketone, has the formula C??H??O? and molecular weight 238.28 g/mol. It bears acetyl groups (-COCH?) at the para positions of each benzene ring in a biphenyl core. Used as an intermediate in synthesizing polymers, liquid crystals, and pharmaceuticals, it relies on its ??-conjugated structure. Store sealed in a cool, dry place to prevent oxidation, maintaining reactivity.