The interesting deuterium isotope e †ects of gossypols have been reinvestigated and the very large two-bond isotope e †ect, 2DC-6(OD), is ascribed to electric Ðeld e †ects. Common to the investigated compounds is the presence of intramolecular hydrogen bonds. A feature strongly related to the streng
Intramolecular hydrogen bonding of the enol forms of β-ketoamides and β-ketothioamides. Deuterium isotope effects on 13C chemical shifts
✍ Scribed by Poul Erik Hansen; Fritz Duus; Simon Bolvig; Tadeusz S. Jagodzinski
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 849 KB
- Volume
- 378
- Category
- Article
- ISSN
- 0022-2860
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract A series of intramolecularly hydrogen‐bonded 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
## Abstract A new class of compounds, the 2‐hydroxythioacetophenones, and related compounds have recently been synthesized. The hydrogen‐bond system has been characterized by NMR chemical shifts and deuterium isotope effects on these as well as by DFT calculations. Use of solid‐state ^13^C NMR has
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
## Abstract Long‐range deuterium isotope effects on ^13^C chemical shifts, ^__n__^ΔC(OD), were studied in the intramolecularly hydrogen‐bonded purpurogallins (benzotropolones). A very large long‐range isotope effect from the hydrogenbonded 4‐OH(D) is observed over six bonds at C‐7. Further, long‐ra