CH2CHSO3H

CH2CHSO3H, also known as vinylsulfonic acid, is an organic compound with the chemical formula C2H4O3S. It is a strong acid and a vinyl monomer. The structure consists of a vinyl group (CH2=CH-) attached to a sulfonic acid group (-SO3H). Vinylsulfonic acid is soluble in water and polar organic solvents.

Vinylsulfonic acid can be synthesized through various methods, including the oxidation of vinyl mercaptan or the reaction of acetylene with sulfur trioxide. Its reactivity stems from the presence of both the double bond and the sulfonic acid functional group. The double bond allows it to undergo polymerization reactions, forming poly(vinylsulfonic acid). The sulfonic acid group imparts strong acidic properties and can participate in salt formation and other acid-catalyzed reactions.

Poly(vinylsulfonic acid) is a polyelectrolyte with applications in areas such as water treatment, as a dispersant, and in ion-exchange resins. Vinylsulfonic acid itself can be used as a comonomer in the synthesis of specialty polymers to introduce sulfonic acid functionality, enhancing properties like hydrophilicity and ionic conductivity. Due to its acidic nature and reactivity, proper handling and safety precautions are necessary when working with vinylsulfonic acid.