✦ LIBER ✦
Complexation of hydroxylated ent-kaurane diterpenoids with boric acid as an aid to the assignment of the 13C NMR spectra
✍ Scribed by Francisco Fernández-Gadea; María L. Jimeno; Benjamín Rodríguez
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 552 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
The 13C NMR spectra of some hydmxylated e n t -k a m e diterpenoids were measured in CDC13-Py-4 (1 : 1) solutiou and also after addition of boric acid. Complexation of ent-3P,l8-, ent-7a;15&, ent-7a,l5cu-, ent-l5B,16B-and ent-16B,17-dihydroq derivatives with boric acid produced considerable chemical shift changes and marked broadening of the signals of the hydroxy-bearing and neighbouring carbon atoms. This behaviour provides a useful and reliable method for assigning the '"C NMR spectra of these compounds.