The complete 1H and 13C assignment of two closely related isomeric triterpenoid derivatives (methyl 2a,3b-di-Oacetylolean-12-en-28-oate and methyl 2a,3a-di-O-acetylurs-12-en-28-oate) is described. In addition to 1D NMR methods, 2D shift-correlated NMR techniques (COSY, NOESY, HMBC and HMQC) were use
Total assignment of the 1H and 13C spectra of peridinin
β Scribed by Stewart McLean; William F. Reynolds; Lisa M. D. John; Winston F. Tinto
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 204 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
Complete ^1^H and ^13^C spectral assignments are reported for peridinin, the major dinoflagellate carotenoid responsible for βred tidesβ in the ocean. These assignments were made with the aid of HETCOR, FLOCK and COSY 2D spectra and NOE difference spectra.
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Conventional one-dimensional NMR methods and two-dimensional shift-correlated NMR experiments (COSY, HMQC, HMBC) were used for 1 H and 13 C chemical shift assignments of two naphthoquinone dimers tectol and tecomaquinone I isolated from Lippia sidoides.
The complete 1 H and 13 C chemical shift assignment of two closely related isomeric triterpenoids, 3Λ,16Λ,20(R),25-tetrahydroxy-2,11,22-trioxocucurbita-5,23(E)-diene and 3Λ,16Λ,20(R)-trihydroxy-25-acetoxy-2,11,22trioxocucurbita-5,23(E)-diene, making use of one-and two-dimensional NMR techniques (HMB
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The rare alkaloid casimiroedine and its peracetylated derivative both show complex 1 H and 13 C spectra with almost all signals doubled owing to slow rotation about the amide bond. Nevertheless, it is possible, using 2D NMR methods, to assign fully the 1 H and 13 C spectra of the major and minor con
## Abstract Isocatalpanol and tecomaquinone I were obtained from roots of __Lippia sidoides__, a medicinal plant from northeast Brazil. Reduction of tecomaquinone I with NaBH~4~ yielded a new derivative. Structural elucidation was done on the basis of spectral data, mainly by highβfield NMR and ele