Ethenylsulfinylbenzene, commonly known as phenyl vinyl sulfoxide, is an organosulfur compound characterized by a vinyl group attached to a sulfinyl group which is further bonded to a phenyl ring. It serves as a versatile and reactive synthetic building block in organic chemistry. Its primary application is as a Michael acceptor in conjugate addition reactions, where the electron-withdrawing sulfinyl group activates the adjacent vinyl double bond. This reactivity is exploited in the synthesis of various sulfur-containing compounds and complex molecules. It is also utilized in cycloaddition reactions and as a precursor for other functionalized sulfoxides. The compound is a valuable intermediate in academic research and pharmaceutical development for constructing carbon-sulfur bonds and introducing chiral sulfinyl groups when used in enantiomerically pure form. Phenyl vinyl sulfoxide must be handled with care under inert conditions due to its sensitivity to moisture and potential reactivity. It is typically stored at low temperatures and is commercially available for use in specialized organic synthesis.