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Lanthanide‐induced shifts in the 1H NMR spectra of N,N‐dimethylformamide and N, N‐dimethylacetamide: Limitations of the point methyl model

The shifts induced in the 1H NMR spectra of N,N‐dimethylformamide and N,N‐dimethylacetamide by Pr(fod)3, have been measured by the reciprocal method and the results analysed using various models of the substrate molecules. Only those models which take full account of the stereochemistry of the methyl groups give a reasonable description of the induced shifts. It is also demonstrated that there is only one time‐averaged position of the lanthanide ion in the framework of the substrate molecule which adequately fits the experimental results.