Used as a solid-supported reagent in organic synthesis, particularly in Wittig reactions where it facilitates the conversion of aldehydes and ketones to alkenes. Its polymeric nature allows for easy separation from reaction mixtures by simple filtration, reducing purification steps. Commonly employed in combinatorial chemistry and parallel synthesis for drug discovery due to its recyclability and compatibility with automated systems. Also utilized in palladium-catalyzed coupling reactions as a phosphine ligand source, enhancing catalyst recovery and stability.