Carbon-13 NMR spectroscopy of pyrrolizidine alkaloids
β Scribed by E. Roeder
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 979 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0031-9422
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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
A method for the determination of the pyrrolizidine alkaloids from Seneciojucobueu (Compositae) by 'H and I3C NMR is presented. 'H NMR is a reliable method for the determination of the total alkaloid level. I3C NMR appears to be a suitable method for the determination of the individual alkaloids. Th
A I3C NMR method has been developed for obtaining simultaneously structural and quantitative information on mixtures of pyrrolizidine alkaloids from Senecio vulgaris L. (Compositae). The samples contained seneciphylline, senecionine, retrorsine and the corresponding E geometrical isomers, spartioidi