Phenethylboronic acid pinacol ester 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. The compound acts as a stable and efficient boron reagent, enabling the coupling of aryl or vinyl groups with various organic halides. Its stability and ease of handling make it a preferred choice in medicinal chemistry for constructing complex molecules. Additionally, it is employed in the development of organic electronic materials, where precise molecular structures are crucial for performance. Its applications extend to polymer chemistry, where it aids in creating specialized polymers with tailored properties.