Dicyclohexylphosphinyl chloride is primarily used as a reagent in organic synthesis, particularly in the preparation of phosphine oxides and other organophosphorus compounds. It serves as a key intermediate in the synthesis of ligands for catalysis, which are essential in various chemical reactions, including cross-coupling reactions. Additionally, it is employed in the modification of polymers and resins to enhance their properties, such as flame retardancy and thermal stability. Its role in the development of advanced materials and specialty chemicals makes it valuable in both industrial and research applications.