17O,15N and13C NMR chemical shifts ofN,N-dimethylmethanesulphinamide in various solvents

Abstract The 17 O, 15 N and 13 C NMR chemical shifts have been determined for N,N ‐dimethylmethanesulphinamide (1), both as the neat liquid and in dimethyl sulphoxide, acetone, chloroform and various alcohols. The 17 O and 15 N nuclei of 1 resonate at a lower frequency than those of the corresponding sulphonamide, and depend on the solvent and concentration of the components in binary solution mixtures. Hydrogen bond‐forming solvents shift the signals to lower frequency than those of the neat amide. On changing the solvent, the change in the 17 O NMR chemical shift of the sulphinamide is smaller than that of carboxamides, but the difference in the 15 N NMR chemical shifts between these two systems with a solvent change is much lower and opposite in direction, reflecting the differences in the resonance structures of carboxamides and sulphinamides.