The chemical shifts of protons and carbon-13 nuclei in aliphatic and aromatic halogen compounds are considered on the basis of inductive, magnetic anisotropy, and intramolecular dispersion effects. It is suggested that a model based on all three effects is more consistent with experiment than a model based on the first two effects only. The dispersion effects in general cause a low-field shift and seem to outweigh magnetic anisotropy effects in some cases.
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Schaefer et al. (1963) studied this question.
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