## Abstract Carbon‐13 signal assignments of the labdane diterpenoids phlogantholide‐A, its diacetate and isophlogantholide‐A are reported. The assignments of the ^13^C NMR signals of 14‐deoxyandrographolide and its diacetate, made earlier, have now been confirmed by lanthanide shift studies on the
Carbon-13 nmr spectra of some ent-rosane diterpenoids
✍ Scribed by Maria C. García-Alvarez; Benjamín Rodríguez; Serafin Valverde; Braulio M. Fragat; Antonio G. Gonzaléz
- Book ID
- 103336212
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 226 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0031-9422
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The tetracyclic diterpenoids are quite widespread in nature. Their biogenesis takes place through the cyclization of suitably oriented pimaradienes'. As an aid to the structural determination of new compounds of this type, we have analysed the 13C NMR spectra of a series of compounds with the ent-be
## Abstract Carbon‐13 NMR signal assignments of the labdane diterpenoids andrographolide and 14‐deoxyandrographolide, along with their acetates, and isodeoxyandrographolide have been made. This study indicates that the C‐6 and C‐11 resonance assignments of isovirescenol‐B, made earlier, should be i
## Abstract ^13^C n.m.r. studies of a series of tricarbocyclic ring C aromatic diterpenoids using proton‐noise and single‐frequency off‐resonance decoupling, partially relaxed Fourier transform techniques, shift reagents and specifically labelled derivatives have permitted unequivocal assignments o