The complete assignments of 1H and 13C NMR data for a series of synthesized diosgenyl saponin analogs are described, viz. diosgenyl b-D-glucopyranoside (1), diosgenyl a-L-rhamnopyranosyl- 7). The assignments were achieved using homo-and heteronuclear two-dimensional NMR techniques.
Complete 1H and 13C NMR assignments of chamigrenes from Aplysia dactilomela
β Scribed by Carlos R. Kaiser; Liane F. Pitombo; Angelo C. Pinto
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 162 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.800
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β¦ Synopsis
Abstract
Stereochemical evaluation and complete ^1^H and ^13^C NMR assignment of the chamigrenes johnstonol (1), pacifenediol (2), pacifidiene (3), pacifenol (4), isolated from the Brazilian mollusc Aplysia dactilomela, were performed using 2D NMR techniques including COSY, NOESY, HSQC and HMBC, combined with AMI calculations and ^1^H NMR spectrum simulations. Copyright Β© 2001 John Wiley & Sons, Ltd.
π SIMILAR VOLUMES
In addition to 1D NMR methods and 2D shift-correlated NMR techniques (COSY and HETCOR), spin-spin simulation and MMX calculations, to obtain the minimum energy conformation structure, were used for the complete 1 H and 13 C NMR assignments of stephalic acid.
## Abstract Four sesquiterpene glucosides were isolated from __Ixeris sonchifolia__ Hance. The structure of a new compound (1) was assigned as 9Ξ²βmonohydroxyβ2,12βdioxoβguaiaβ3,11(13)βdienβ1Ξ±,5Ξ±,6Ξ²,7Ξ±,9Ξ²,10Ξ±Hβ12,6βolideβ9β__O__βΞ²βDβ glucopyranoside (ixerinoside). In addition, unambiguous and comple