Used as a reagent in organic synthesis, particularly in Wittig reactions to convert carbonyl compounds into alkenes. It facilitates the formation of carbon-carbon double bonds, enabling the construction of complex organic molecules, especially in pharmaceuticals and fine chemicals. Its butenyl group allows for the introduction of a conjugated diene system when reacted with aldehydes or ketones, making it valuable in the synthesis of intermediates for natural products and bioactive compounds. The phosphonium salt is stable and easy to handle, which enhances its utility in laboratory-scale transformations.