## Abstract The Ketonic ^13^C NMR signals of a series of 6โhydroxyโ5โoxobicyclo[2.2.2]octโ7โeneโ2โcarboxylic acid lactones and of haplophytine and related __N__โsubstituted 3โpiperidinones occur at exceptionally high field; the structural factors which are responsible have been elucidated by compar
Unusually large protonation shifts of aromatic carboxylic acids in carbon-13 nuclear magnetic resonance
โ Scribed by Yoshio Kosugi; Tsugio Takeuchi
- Publisher
- Elsevier Science
- Year
- 1978
- Weight
- 333 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0022-2364
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๐ SIMILAR VOLUMES
A method for the accurate determination of 13C enrichments in nonprotonated carbon atoms of organic compounds that makes use of unresolved 13C satellites of proton(s) bonded to the vicinal carbon atom was developed. Using glutamate as a model molecule, this 1H nuclear magnetic resonance (NMR) invers
## Abstract The ^13^C chemical shifts and spinโlattice relaxation times are reported for __cyclo__(LโProโLโLeu) and __cyclo__(LโProโDโLeu). The chemical shifts of the D and L leucyl residues in the cyclic peptides differ from each other by 1.8 and 3.6 parts per million for the ฮฑ and ฮฒ carbons, resp