Hydration of olefins in excess water catalyzed by an insoluble cesium hydrogen salt of dodecatungstophosphoric acid

Article abstract of DOI:10.1246/cl.1997.839

A solid acid, Cs_2.5H_0.5PW₁₂O₄₀, efficiently catalyzed hydration of 2,3-dimethylbut-2-ene in excess water at 343 K, while typical oxide-based catalysts such as Nb₂O₅, SiO₂-Al₂O₃, TiO₂-SiO₂, and SO₄^2- / ZrO₂ were almost inactive. The activity (per unit weight) of Cs_2.5H_0.5PW₁₂O₄₀ was found to be higher than those of liquid acids like H₃PW₁₂O₄₀ and H₂SO₄, and of a commercial solid acid, H-ZSM-5, for hydration of cyclohexene.