Widely used in organic synthesis as a stable phosphine ligand precursor, particularly in transition metal-catalyzed reactions such as cross-coupling reactions. Its borane adduct enhances air and moisture stability, making it easier to handle than free phosphines. Commonly employed in palladium-catalyzed reactions including Suzuki–Miyaura and Buchwald–Hartwig aminations, where it helps improve catalyst efficiency and selectivity. Also utilized in the synthesis of pharmaceuticals and fine chemicals due to its reliable performance and ease of purification.