## 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
Infrared and 1H nuclear magnetic resonance studies of solvent effect on hydrogen bond in some pyridine n-oxide trifluoroacetates
✍ Scribed by Bogumił Brycki; Mirosław Szafran
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 474 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0167-7322
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The "N NMR chemical shifts of ten substituted pyridines (B) and their complexes with trifluoroacetic acid (AHB) were measured at the natural abundance level in dichloromethane. The plot of the relative chemical shifts [A6("N) = G(AHB) -6(B)] against ApK, gives a titration curve which reflects a prot
## Synopsis Concentration and temperature dependences of the 'H nmr spectra of N-acetyl-L-proline N-methylamide were observed in various solvents [CCld, CDCl:j, (CD:j)&O, (CD:JaSO, H&, and D20]. The fraction of the cis isomer (with respect to the bond between the acetyl carbonyl carbon and prolyl