The appearance of two new i.r. bands at 1495 and 1245 cm–1 is evidence for a sulphone-like intermediate involved in the isomerization of n-butenes by sulphur dioxide adsorbed on zeolite NaCaA.
H. Förster and R. Seelemann, J. Chem. Soc., Chem. Commun., 1976, 1060a DOI: 10.1039/C3976001060A
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