p-Tolylboronic acid is widely used in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. This reaction is essential for forming carbon-carbon bonds, making it valuable in the production of pharmaceuticals, agrochemicals, and advanced materials. It serves as a key intermediate in the synthesis of complex organic molecules, including bioactive compounds and polymers. Additionally, it is employed in the development of sensors and catalysts due to its ability to interact with various functional groups. Its versatility and reactivity make it a crucial component in modern synthetic chemistry.