(9H-Carbazol-3-yl)boronic acid is primarily used in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. This reaction is widely employed to form carbon-carbon bonds, making it valuable in the synthesis of complex organic molecules, including pharmaceuticals, agrochemicals, and materials. The compound serves as a key intermediate in the preparation of carbazole derivatives, which are known for their applications in optoelectronic materials, such as organic light-emitting diodes (OLEDs) and organic photovoltaics (OPVs). Additionally, it is utilized in the development of bioactive compounds and polymers with specific functional properties. Its boronic acid group facilitates efficient and selective coupling reactions, enhancing its utility in diverse chemical transformations.