(2-Methyl-4-carboxyphenyl)boronic acid is an aromatic boronic acid derivative featuring both a boronic acid group and a carboxylic acid group on the benzene ring, with an additional methyl substituent. This bifunctional structure makes it a versatile building block in synthetic chemistry, particularly in Suzuki-Miyaura cross-coupling reactions, where the boronic acid group acts as a key coupling partner. Its primary and significant application lies in the field of materials science, specifically as a precursor for organic light-emitting diodes (OLEDs) and other organic electronic materials. The molecule serves as a core unit for constructing complex conjugated systems, such as those used in host materials, electron transport layers, or emissive dopants. The presence of both boronic acid and carboxylic acid functionalities allows for sequential or divergent synthetic modifications, enabling the creation of tailored molecular architectures with specific optoelectronic properties. While it finds use as a general synthetic intermediate in pharmaceutical and agrochemical research, its design and utility are prominently directed towards advanced material development. The compound requires careful handling under inert conditions due to the sensitivity of the boronic acid group to protodeboronation and oxidation.