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Lanthanide‐induced shifts in the 1 H NMR spectra of N , N ‐dimethylformamide and N , N ‐dimethylacetamide: Limitations of the point methyl model
Author(s) -
Ladd J. A.
Publication year - 1989
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260270511
Subject(s) - chemistry , dimethylacetamide , lanthanide , dimethylformamide , nmr spectra database , spectral line , molecule , substrate (aquarium) , reciprocal , proton nmr , stereochemistry , crystallography , computational chemistry , analytical chemistry (journal) , ion , organic chemistry , physics , linguistics , oceanography , philosophy , solvent , geology , astronomy
The shifts induced in the 1 H 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.