Fourier transform 17O NMR spectra have been measured for a number of meta and para substituted anisoles in natural abundance at 10.8 MHz. The shielding of the methoxyl oxygen nucleus decreases as the electron-withdrawing substituents are introduced to the ring. A good linear correlation is obtained for a plot of the 17O shifts versus the Hammett σ− constants.
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Katoh et al. (1979) studied this question.
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