Abstract
The NMR shift reagent (Eu(fod) 3), NOE and selective proton decoupling have been applied to assign N 1 (CH) 3 group signals in 1H and 13C NMR spectra of N 1N 1-dimethylamidines. The upfield N 1-CH 3 carbon resonance is synperiplanar to the imino nitrogen (N 2) and the downfield one is antiperiplanar. In 1H spectra of amidines the effect of magnetic anisotropy of aromatic subsituent at N 2 is sufficient to invert the position of two N-CH 3 signals.
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