2-(Ethylthio)phenylboronic 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 production of pharmaceuticals, agrochemicals, and advanced materials. The compound serves as a key intermediate in the synthesis of complex organic molecules, enabling the creation of diverse chemical structures with high precision. Its boronic acid group facilitates the coupling with aryl halides, making it a versatile reagent in medicinal chemistry for drug discovery and development. Additionally, it finds applications in the preparation of functionalized polymers and materials with tailored properties for industrial use.