Used as a key intermediate in the synthesis of phosphine ligands for transition metal catalysis, particularly in cross-coupling reactions such as Suzuki-Miyaura and Buchwald-Hartwig aminations. Its structure allows for fine-tuning of steric and electronic properties in ligand design, enhancing catalyst efficiency and selectivity. Also employed in the preparation of organophosphorus compounds for optoelectronic materials and as a stabilizer in some polymer systems due to its resistance to oxidation.