4-Chloro-3-cyanophenylboronic 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. Its boronic acid group acts as a key coupling partner with aryl halides, enabling the synthesis of complex organic molecules. Additionally, the presence of both chloro and cyano substituents enhances its reactivity and selectivity in various catalytic processes. It is also employed in the development of sensors and probes due to its ability to interact with diols and other biological molecules, making it useful in biochemical research and diagnostics.