Abstract
The magnetic nonequivalences between the ceminal protons of phenyl phenacyl sulfoxides and phenyl benzyl sulfoxides have been measured in a variety of solvents. A clear correlation observed between the electron withdrawal power of substituent and VA-VB is discussed by considering the geometry of these protons with respect to the S-O bond. It is suggested that reaction field effects, specific solvent-solute interactions, as well as the electronic character of substituents are responsible for the observed change in magnetic nonequivalence. It is also suggested that, by a careful consideration of solvent effects, it is possible to make an assignment of these protons, a method for which has not hitherto been proposed for acyclic systems.
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