## Abstract The OH chemical shift of the enol form of nitromalonamide is found at 18.9 ppm both in DMSOโ__d__~6~ and in DMFโ__d__~7~ indicating a very strong hydrogen bond. The OH chemical shift is insensitive to temperature changes. Contrary to the large OH chemical shift, a small twoโbond deuteri
Nonadditivity of D/H isotope effects on 13C chemical shifts in halomethanes
โ Scribed by N.M. Sergeyev; N.D. Sergeyeva; W.T. Raynes
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 679 KB
- Volume
- 221
- Category
- Article
- ISSN
- 0009-2614
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๐ SIMILAR VOLUMES
Over 100 isotope effects on "C chemical shifts were determined in a series of deuteriated cis-stilbene isotopomers. The magnitude and sign of these effects depend on the position and the number of deuterium atoms in the molecule. The variations in two-and three-bond effects were rationalized by ste
Exchange of amide protons with deuterium results in changes of 13 C chemical shifts for carbon atoms near the site of substitution (CH{N and N{C|O). There is a measurable decrease in the isotopic shifts of CH{N for cycloalkylacetamides as ring size increases from 3 to 8 and for lactams as ring size
Primary p\*J(13C,H) and secondary s\*J(13C,H) isotope e โ ects on carbonรproton coupling constants were measured in studies of proton-and deuteron-coupled 13C NMR spectra of the halomethanes CH n D m X 4~n~m , where X is Cl, Br or I. Both e โ ects are always negative. The magnitudes of p\*J(13C,H) inc
## Abstract The oneโ and twoโbond ^13^C isotope shifts, typically โ1.5 to โ2.5 ppb and โ0.7 ppb respectively, in nonโcyclic aliphatic systems and up to โ4.4 ppb and โ1.0 ppb in glucose cause effects that need to be taken into account in the adaptive NMR spectral libraryโbased quantification of the