4-Biphenyl-2-chlorocarboxylic acid is an organic compound featuring a biphenyl core substituted with a carboxylic acid group and a chlorine atom at the 2-position. It serves as a key synthetic intermediate in the production of advanced organic electronic materials. Its primary application is in the field of organic light-emitting diodes (OLEDs) and organic photovoltaics (OPVs). The biphenyl moiety provides rigidity and planarity, which are beneficial for charge transport and luminescence properties. The carboxylic acid and chlorine functional groups offer versatile handles for further chemical modifications, such as esterification, amidation, or cross-coupling reactions, to construct more complex conjugated molecules, host materials, or electron-transporting layers. This compound is a valuable building block for researchers and manufacturers developing next-generation display and lighting technologies, as well as organic solar cells.