o-Tolylboronic acid is widely used in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. This reaction is essential for forming carbon-carbon bonds, enabling the synthesis of complex organic molecules, including pharmaceuticals, agrochemicals, and advanced materials. It serves as a key reagent in the production of biaryl compounds, which are common structural motifs in many drugs and functional materials. Additionally, it is employed in the development of organic electronic materials, such as OLEDs, due to its ability to introduce aromatic groups into molecular frameworks. Its stability and reactivity make it a valuable tool in medicinal chemistry for creating diverse chemical libraries for drug discovery.