Sulphonic anhydrides and dimethylformamide convert ketones and aldehydes into enol sulphonates, which are generally relatively stable towards acids and bases but regenerate the carbonyl compounds by O–S bond cleavage on more vigorous treatment.
N. Frydman, R. Bixon, M. Sprecher and Y. Mazur, J. Chem. Soc. D, 1969, 1044b DOI: 10.1039/C2969001044B
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