## Abstract Chemical shifts of H‐bonded protons in tetrabutylammonium hydrogen maleate and 14‐substituted picolinic acid __N__‐oxides have been measured in a number of dry solvents, of different activity, in order to distinguish between symmetrical single minimum and asymmetrical hydrogen bonds. In
Hydrogen on unsupported ruthenium sulfide: Thermodesorption and 1H NMR studies
✍ Scribed by Michel Lacroix; Shibin Yuan; Michtle Breysse; Claudine Dorémieux-Morin; Jacques Fraissard
- Book ID
- 113180468
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 285 KB
- Volume
- 138
- Category
- Article
- ISSN
- 0021-9517
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## Abstract The chemical shifts of hydrogen bonded protons in complexes of 11 substituted pyridines with trifluoroacetic acid were examined, in five dry solvents of different activity, with respect to proton transfer and aggregation effects. The results were correlated with Δp__K__~__a__~, the Kirk
Conformational stabilization by intramolecular hydrogen bonding of two histamine H 3receptor agonists is studied by ~H NMR. Stabilization of each individual conformation of the compounds by intramolecular hydrogen bonding is not strong at physiological pH and temperature. However, 52% -61% of the mo