Pinacol 4-(ethylsulfonamide) phenylborate is primarily used in organic synthesis as a versatile reagent, particularly in cross-coupling reactions. It serves as a stable boronate ester, facilitating the introduction of phenyl groups into various organic molecules. This compound is valuable in Suzuki-Miyaura coupling reactions, enabling the formation of carbon-carbon bonds in the synthesis of pharmaceuticals, agrochemicals, and advanced materials. Its stability and reactivity make it a preferred choice for constructing complex molecular architectures. Additionally, it is employed in the development of fluorescent probes and sensors due to its ability to interact with specific analytes, aiding in biochemical and environmental detection applications.