## Abstract The tautomerism of 5(6)‐methoxy‐2‐{[(4‐methoxy‐3,5‐dimethyl‐2‐pyridinyl)methyl] sulfinyl}‐1__H__‐benzimidazole (omeprazole) was determined in solution, __K__~__T__~ = 0.59 in THF at 195 K, in favor of the 6‐methoxy tautomer. The assignment of the signals was made by comparison with its
13C and 1H NMR studies of structure and tautomerism in some perimidines
✍ Scribed by P. D. Woodgate; J. M. Herbert; W. A. Denny
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- English
- Weight
- 604 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
The 13C NMR spectra of some 1and 2-substituted perimidines and perimidinium salts are discussed and assigned. Although the spectra of most of the 2-substituted perimidines are comparatively simple, several examples display I3C and 'H spectral characteristics indicative of inhibition of prototropic tautomerism.
📜 SIMILAR VOLUMES
## Abstract Aldehyde (δCH) and enolic (δOH) proton chemical shifts, the corresponding spin–spin coupling constants (__J__CH,OH) and the ^13^C chemical shifts (δC) have been measured for three cyclic β‐ketoaldehydes as a function of temperature. A tautomeric equilibrium has been shown to exist betwe
I3C and 'H NMR spectral data for a homologous series of tertiary arsines (R,As, where R = Me, Et, n-Pr and Ph), aminoarsines and arsonium and aminoarsonium salts are reported and discussed. In nearly all cases, quaternization of the tertiary arsine to its corresponding arsonium or aminoarsonium salt
H and lSC NMR chemical shifts are reported and assigned for 1,4,9,10-and 2,3,9,1 O-anthracenetetrone. In addition, NMR data are given for 2,3-dihydroxy-9, 1 O-anthraquinone, 2.3-dimethoxy-9.10anthraquinone and 1 -hydroxy-2-acetoxy-9,l O-anthraquinone, encountered during the preparation of the anthra