Specific intramolecular C-H...O interactions in 1-vinyl-2-formylimidazole and 1-vinyl-2-formylbenzimidazole studied by 1H and 13C NMR spectral data

Article abstract of DOI:10.1007/BF01431606

According to the ¹H and ¹³C NMR spectral data, the vinyl group in 1-vinyl-2-formylimidazole and 1-vinyl-2-formylbenzimidazole is trans-oriented with respect to the formyl fragment, while the carbonyl group occupies the anti-position with respect to the N atom of pyridine cycle. A specific intramolecular C-H...O interaction of a weak hydrogen bond type is realized between the α-H atom of the vinyl group and O atom of the carbonyl group.