## Abstract Carbonโ13 chemical shift assignments have been obtained for the naturally occurring __Cephalotaxus__ alkaloids, cephalotaxine, acetylcephalotaxine, harringtonine, isoharringtonine, drupacine and cephalotaxinone.
Carbon-13 nuclear magnetic resonance spectroscopy of conjugated polyynes
โ Scribed by Ferdinand Bohlmann; Manfred Brehm
- Publisher
- John Wiley and Sons
- Year
- 1979
- Tongue
- English
- Weight
- 143 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
โฆ Synopsis
Abstract
The ^13^C NMR spectra of several conjugated polyyneโaldehydes and ketones are compared with those of the corresponding alcohols. All data show considerable effects similar to those observed in conjugated polyenes.
๐ SIMILAR VOLUMES
## Abstract Carbonโ13 chemical shifts of sixteen monosubstituted ethylenes were obtained. In order to explain the chemical shifts, ฯ and ฯ electron densities of these compounds are calculated by the ฯโincluded ฯโHMO method.See Ref. 8. A linear relationship exists between carbonโ13 chemical shifts
## Abstract Carbonโ13 NMR chemical shifts are reported for six angular and one linear dichloropyridoquinolines in CDCl~3~. The chemical shift assignments have been made using model compounds, fully coupled spectra, selective proton decoupling and results from lanthanide shift studies. Chlorine subs
## Abstract The ^13^C NMR spectra were determined and signals assigned to the various carbons of veratridine and cevadine.
## Abstract The ^13^C NMR spectra were determined and signals assigned to the various carbons of the alkamines veracevine, germine and zygacine derived from steroidal alkaloids of the ceveratrum class. Assignment of signals was aided by analysis of the partially relaxed spectrum of cervagenine 9,12