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- W2017105605 abstract "The doubling of the NMR signals of the isopropyl methyl protons in 2,4-dichlorophenyl methyl isopropylphosphoramidate has been shown to be due to a difference in chemical shift of the two methyl groups. This difference is ascribed to a steric hindrance to rotation about the N-C bond which enhances the inherent nonequivalence due to molecular asymmetry. Studies of the changes in chemical shift difference with changes in temperature, concentration and solvent show the steric hindrance to be due to intermolecular hydrogen bonding. The NMR data are correlated with infrared spectra of the phosphoramidate obtained under similar conditions; these spectra support the hydrogen bonding hypothesis. Possible hydrogenbonded species are discussed." @default.
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- W2017105605 modified "2023-09-27" @default.
- W2017105605 title "The enhancement of asymmetry effects in NMR by intermolecular hydrogen bonding" @default.
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- W2017105605 doi "https://doi.org/10.1016/0584-8539(69)80172-8" @default.
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