3'-Methoxybiphenyl-3-carboxylic acid is primarily utilized in organic synthesis as a key intermediate in the production of various pharmaceuticals and fine chemicals. Its structure, featuring both a methoxy group and a carboxylic acid, makes it versatile for constructing complex molecules, particularly in the development of drug candidates. It is often employed in coupling reactions to create biphenyl derivatives, which are essential in medicinal chemistry for designing compounds with specific biological activities. Additionally, it serves as a building block in the synthesis of liquid crystals and organic electronic materials, where precise molecular architecture is crucial for functionality.