The sign 'J(NN) of 2-chlor0-6-methyl-['~N,]pyrimidine has been determined by 'H-('H (selective), "N (selective)} and 13C-(1H (noise), I5N (selective)} triple resonance techniques. The sign was proved to be negative (-1.6 Hz); consequently, chlorine substitution at C-2 was found to make ' . I ( " ) m
Determination of the sign for a one-bond 15N15N spin-spin coupling constant: The flip angle effect
✍ Scribed by Theo Berkhoudt; Hans J Jakobsen
- Publisher
- Elsevier Science
- Year
- 1982
- Weight
- 342 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0022-2364
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📜 SIMILAR VOLUMES
Non-empirical calculations using the equations-of-motion approach are reported for iJ( 15Nt5N) in hydrazine, diazene, isodiazene, the azide anion, and nitrogen. Irrespective of the single or multiple nature of the bond between the nitrogens, iJ( isNi5N) should be negative in all compounds. The only
## Abstract The first successful observation of the vicinal ^15^N,^13^C spin‐coupling constants in a series of amino acids, comprising Val, Ile, Leu and Thr, in which the α‐nitrogens are fully replaced with ^15^N, is described. A Karplus‐type dihedral‐angle dependence was noted for the coupling con