Conformational structure of N-ethylacetamide and N-Isopropylacetamide (cas 1118-69-0). NMR shift reagent study

Add time:09/09/2019    Source:sciencedirect.com

The structure of the stable conformers of N-ethylacetamide and N-isopropylacetamide was determined by NMR spectroscopy with lanthanide shift reagents. N-ethylacetamide was found to exist in the form of two mirror-image isomers, with the ethyl group twisted out of the plane of the amide bond by the angle ψ XXX ± 105°. Similarly N-isopropylacetamide exists in the form of two mirror-image isomers, with the isopropyl methyl groups in positions with ψ1 XXX ± 90° and ψ2 XXX ∓ 150°.

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