Used as a phosphonium salt in Wittig reactions to convert aldehydes and ketones into alkenes, particularly effective in synthesizing styrene derivatives and other conjugated systems. Its pyridine-containing structure enhances solubility in polar solvents and can improve reaction selectivity. Commonly employed in organic synthesis for constructing carbon-carbon double bonds in pharmaceuticals and fine chemicals. Also utilized as a precursor for preparing functionalized olefins in materials science and medicinal chemistry applications.