Tritium isotope effects on carbon-13 NMR chemical shifts
β Scribed by Arrowsmith, Cheryl H.; Baltzer, Lars.; Kresge, A. Jerry.; Powell, Michael F.; Tang, Yui S.
- Book ID
- 127024840
- Publisher
- American Chemical Society
- Year
- 1986
- Tongue
- English
- Weight
- 326 KB
- Volume
- 108
- Category
- Article
- ISSN
- 0002-7863
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π SIMILAR VOLUMES
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
## Abstract An isotope effect of about 0Β·1 Hz at 25 MHz (0Β·004 ppm) on the ^13^C chemical shifts due to directly bonded chlorine has been observed at β50Β°C for hexachloropropene, hexachlorobutadiene and tetrachlorobutenyne. This effect yields an unambiguous assignment of ^13^C NMR lines to specific
## Abstract The OH chemical shift of the enol form of nitromalonamide is found at 18.9 ppm both in DMSOβ__d__~6~ and in DMFβ__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 twoβbond deuteri