Chemistry of the SO bond. Part II. Nuclear magnetic resonance and infrared studies on ethylene sulphites (1,3,2-dioxathiolan 2-oxides)

The 100 MHz 1H spectra of methyl-substituted ethylene sulphites have been examined in several solvents. In all cases, the 1H spectra have been fully analysed and it has been possible to establish a chemical shift additivity for a series of compounds. Interpretation of the 1H spectra together with an i.r. study of the SO stretching frequency of the sulphites in various solvents strongly suggests the existence of only a single (and basically similar) conformation in solution for each of these sulphites.