Magnetic Resonance in Chemistry p. 970 - 973 (1988)
Update date:2022-08-16
Topics:
Brown, David A.
Glass, William K.
Mageswaran, Rajeswary
Girmay, Berhane
The first example of cis-trans isomerism in monoalkylhydroxamic acids, detected by 1H, 13C and 15N NMR spectroscopy, is reported.The 15N NMR spectrum of CH3CO(15)NHOH gave a clear assignment of the OH and NH protons of both Z and E isomers.The assignment was confirmed by 1H and 13C NMR spectroscopy.A rotational barrier of isomerization (ΔG++c) of 17.8 kcal mol -1 was calculated from the variable-temperature 1H NMR spectra using the method of Shanan-Atidi and Bar-Eli.KEY WORDS cis-trans Isomerism 1H, 13C and 15N NMR Monoalkylhydroxamic acids Rotational barrier
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