Strongly acidic (pKa ≈ −3.5) room-temperature ionic liquids (ILs) with –OSO3H functionalized cations are introduced. The strong acidity, easy synthesis, and better physical properties of these R–OSO3H ILs make them excellent alternatives to the well-known sulfonic acid (R–SO3H) ILs, especially in the domain of metal processing.
D. Dupont, E. Renders and K. Binnemans, Chem. Commun., 2016, 52, 4640 DOI: 10.1039/C6CC00094K
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