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 SνSO2 are correlated by σ+ values of meta- and para-substituents.
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