Substituent effects in aromatic proton nuclear magnetic resonance spectra. Part VII. [2H6]Benzene-induced solvent shifts at high solute concentration

Abstract

The benzene-induced solvent shifts of some 1-substituted 3,5-dimethylbenzenes (I) and monosubstituted mesitylenes (II) were determined at high concentrations of solute for which the number of moles of the solute is comparable with that of the solvent. It was shown that the conventional 1 : 1 complex model can account for the observed shifts when the substituent is not a halogen. The possible origin of the anomaly observed for halogen derivatives is discussed.