## Abstract The carbonβ13 chemical shifts of strychnine and ten closely related analogues have been assigned and confirmed in several cases using selective proton decoupling techniques. Where additivity relationships are used the importance of having data on an array of structural analogues is emph
Carbon-13 n.m.r. spectroscopy of some Strychnos alkaloids
β Scribed by R. Verpoorte; P. J. Hylands; N. G. Bisset
- Book ID
- 102950531
- Publisher
- John Wiley and Sons
- Year
- 1977
- Tongue
- English
- Weight
- 521 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
^13^C N.m.r. spectra have been determined for strychnine and a series of fourteen derivatives. The assignments are based on previously established data and on offβresonance decoupled spectra. The shifts resulting from the alterations in molecular structure are discussed and explained, in part, as a consequence of conformational changes. This detailed study indicates that changes are required in some previously published assignments.
π SIMILAR VOLUMES
London SW3 6LX, UK CNMR data for a series of natural and semi-synthetic ar-hydroxy-and -metho--substituted Strychnos alkaloids are presented and are used to determine substituent-induced chemical shift (SCS) values for the various substitution patterns. 13 R1 H R3 20 alkaloids have been examined. Th
## Abstract The ^13^C n.m.r. spectra of some dimeric __Catharanthus__ alkaloids are reported and assigned. Methods devised to aid in the assignment of resonances in complex molecules are described. The ^13^C n.m.r. spectra of several derivatives of vinblastine are discussed.
## Abstract The ^13^C n.m.r. spectra of the 5Ξ²βhydroxylated phytoecdysones polypodine B, muristerone A and kaladasterone are presented and briefly discussed together with the spectrum of makisterone A. Comparisons with previously reported spectra of ecdysone, ecdysterone and poststerone are made an