## Abstract The tautomerism and protonation of the putative inotropic 2β(2β²,4β²βdimethoxy)phenylβ1__H__βimidazo[1,2β__a__]imidazole (2) has been studied in several solvents by comparing its ^1^H and ^13^C chemical shifts with those of its 1β and 7βmethyl derivatives 3 and 4, respectively, and acid s
Dynamics of proton tautomerism in 2,5-dihydroxy-p-benzoquinone: A 13C NMR and CNDO study
β Scribed by F. Graf
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 365 KB
- Volume
- 62
- Category
- Article
- ISSN
- 0009-2614
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## Abstract Carbonβ13 NMR study of 4(5)βvinylβ1,2,3βtriazole in dimethylformamide at β55Β°C allows direct observation of the three separate tautomers. The ^13^C chemical shift values of the three forms, as well as their percentages in the tautomeric mixture, are given.
## Abstract The ^13^C and ^31^P NMR spectra of the triply ^13^C labelled tribenzoylphosphine [] oriented in a nematic phase have been recorded. From the spectral analysis one obtains the average CPC valence bond angle value (95.9°± 0.2), and the phosphorus chemical shift anisotropy ΞΟ(Ο~β₯οΈ~ β Ο ~β₯~