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Nitrogen-15 magnetic resonance spectroscopy. X. Angular dependence of vicinal 15N-H coupling constants in amino acids

โœ 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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Nitrogen-15 nuclear magnetic resonance s
โœ Mukund P. Sibi; Robert L. Lichter ๐Ÿ“‚ Article ๐Ÿ“… 1980 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 298 KB

## Abstract Twoโ€to fiveโ€bond ^15^N๏ฃฟ^19^F coupling constants have been determined for fluoropyridines, 8โ€fluoroquinoline, fluoroanilines and fluoroaniline derivatives. Only in 2โ€fluoropyridine is __J__(NF) large, and this is associated with a lone pair mediated enhancement of the coupling. Values in

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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