3-Methoxynaphthalene-2-boronic acid is an aromatic boronic acid derivative featuring a naphthalene core substituted with a methoxy group and a boronic acid group at the 2-position. It is a white to off-white crystalline powder with a molecular formula of C₁₁H₁₁BO₃. This compound is primarily utilized as a key synthetic building block in the preparation of organic electronic materials, particularly for organic light-emitting diodes (OLEDs) and organic photovoltaics (OPVs). It serves as a crucial monomer in Suzuki-Miyaura cross-coupling reactions, enabling the construction of extended π-conjugated systems, such as polyfluorenes, polycarbazoles, and other naphthalene-based polymers or small molecules. These materials are essential for the development of efficient hole-transport layers (HTL), electron-transport layers (ETL), and emissive layers in OLED devices. As a boronic acid derivative, it is also a versatile intermediate in general organic synthesis for constructing biaryl linkages. Its application is firmly rooted in advanced material science, driving research and development in next-generation display and energy technologies.