## 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
An increment system for deuterium isotope effects on 13C chemical shifts of methylated benzenes
β Scribed by Stefan Berger; Bernd W. K. Diehl
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- English
- Weight
- 577 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0749-1581
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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 A series of intramolecularly hydrogenβbonded enamines, enols and enethiols with ester carbonylic, ketonic carbonylic, thioester carbonylic, nitro and sulphoxide acceptors were investigated to obtain ^13^C chemical shifts and deuterium isotope effects. Results from 33 new compounds and s
17O chemical shifts were measured in 40 enamines activated in the b-position by CxO, COO, NO 2 , SO and groups. Data for the oxygen-containing series of o-hydroxyacyl aromatics are also included for com-SO 2 parison. Intramolecular hydrogen bonding in the enamines is discussed in terms of the accept
The interesting deuterium isotope e β ects of gossypols have been reinvestigated and the very large two-bond isotope e β ect, 2DC-6(OD), is ascribed to electric Γeld e β ects. Common to the investigated compounds is the presence of intramolecular hydrogen bonds. A feature strongly related to the streng