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A chemical shift analysis of the 13C NMR spectra of more than 50 acyclic sulphonic acids, alkali metal sulphonates and methyl esters was carried out. Chemical shift increment systems with n-alkanes as reference molecules were established for linear alkanesulphonates and alk-2-enesulphonates. Some shortchain fluorinated sulphonic acids were also studied, especially pentafluorothio derivatives. C-F spin-spin coupling constants were determined. Pauling electronegativity values for SO,H and SF, groups were derived from a chemical shift increments.

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The "C NMR spectra of 20 compounds belonging to several types of monocyclic sultones and related 'carbyl sulphates,' including a series of fluorinated 8-sultones(1,2-0xathietane 2,2-dioxides), are reported. Chemical shift increment systems with n-alkanes a s reference molecules are established for non-fluorinated sultones: they show a much less pronounced deshielding effect on the carbon a to oxygen in /3-sultones than in the other series. Chemical shifts for the parent 8-sultone, predicted in two ways (linear or cyclic model compound), are found to be almost consistent with a purely additive scheme. In fluorinated 8-sultones the asubstituent increments relative t o perfluoroethanesultone are also derived.

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