Temperature dependent splitting of N-alkyl 1H and 13C NMR signals in a series of 4-oxo-4H-chromene-2-carboxamides has been analysed in terms of rotation of the amide group. Rotational barriers have been calculated from dynamic 1H NMR data and the conformational options have been explored.
D. N. Davidson and P. T. Kaye, J. Chem. Soc., Perkin Trans. 2, 1991, 927 DOI: 10.1039/P29910000927
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