This bis(phosphonium) salt is primarily used in organic synthesis as a precursor for Wittig reagents, facilitating the conversion of carbonyl compounds to alkenes, particularly in double Wittig reactions to form dienes or extended conjugated systems. It plays a key role in the polymerization of p-xylylene to produce parylene polymers, which are renowned for their thermal stability, chemical resistance, and use in conformal coatings for electronics and medical devices. Additionally, it is employed in materials chemistry and nanotechnology research to develop advanced polymers, thin films, and novel materials with tailored properties.