Infrared intensities as a quantitative measure of intramolecular interactions. Part XXIX. Methyl phenyl sulphones and sulphoxides

Abstract

The integrated i.r. intensities of the ν⁸ band for series of meta- and para-substituted methyl phenyl sulphoxides and sulphones show that whereas MeSO₂ is a resonance acceptor σ°_R+ 0·06, MeSO is a net resonance donor σ°_R– 0·07. However, when para to a strong donor group, both MeSO₂ and MeSO become resonance acceptors of considerable magnitude. Intensities of as and Sν_SO2 are correlated by σ⁺ values of meta- and para-substituents.