Used as a phosphorus-based reagent in organic synthesis, particularly in Wittig reactions where it facilitates the formation of carbon-carbon double bonds. It serves as a precursor to ylides that convert aldehydes and ketones into alkenes under mild conditions. Its ammonium functionality allows for enhanced solubility in polar solvents, making it suitable for reactions in aqueous or mixed solvent systems. Also employed in the synthesis of biologically active compounds, including pharmaceuticals and agrochemicals, due to its ability to introduce vinyl or styrene-like moieties.