Nitrogen-15 magnetic resonance spectroscopy. X. Angular dependence of vicinal 15N-H coupling constants in amino acids
โ Scribed by Lichter, Robert L.; Roberts, John D.
- Book ID
- 126202442
- Publisher
- American Chemical Society
- Year
- 1970
- Tongue
- English
- Weight
- 247 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0022-3263
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## Abstract Twoโto fiveโbond ^15^N๏ฃฟ^19^F coupling constants have been determined for fluoropyridines, 8โfluoroquinoline, fluoroanilines and fluoroaniline derivatives. Only in 2โfluoropyridine is __J__(NF) large, and this is associated with a lone pair mediated enhancement of the coupling. Values in
The vicinal "G'H, "N-'H and %-"N spin coupling constants were obtained from the 'H and =C NMR spectra of various ionic forms of the amino acids phenylalanine, a-aminobutyric acid and p-alanine, and also from their "N isotopomers. It is concluded that the "C-'H and =N-lH coupling constants are reliab