Abstract-Hindered rotation in two o-substituted N,N-dimethylthiobenzamides was investigated by variable temperature lH NMR spectroscopy. For one compound, the enthalpies and entropies of activation for (i) thioamide group rotation around the Ar-C bond and (ii) dimethylamino group rotation around the C-N bond were obtained by full line shape analysis; a possible coupling between the two processes is discussed, A new simple method has also been applied to the analysis of dimethylamino exchange and results are in complete agreement with the full line shape analysis with somewhat better precision.
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