Deprotonated acetylsulphuric and acetyldisuiphuric acids form quantitatively when sulphur trioxide is added to acetic acid in liquid sulphur dioxide at –78°. With a SO3 : AcOH mole ratio > 1 formation and ionization of the free acids into acetylium and polysulphate ions occur. A plausible mechanism is given.
E. Montoneri, M. Fornaroli, L. Giuffré, E. Tempesti and G. Sioli, J. Chem. Soc., Perkin Trans. 2, 1976, 1784 DOI: 10.1039/P29760001784
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