✦ LIBER ✦
NMR spectral assignment and conformation of macrocyclic biaryl ethers from Garuga gamblei
✍ Scribed by H. Kalchhauser; H. G. Krishnamurty
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 436 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
The assignment of the 'H and I3C NMR spectra of macrocyclic biphenyl ethers isolated from Guruga gambki King was performed by 2D NMR techniques. An erroneous assignment given in the literature for one of the compounds was corrected. The use of shift increment systems and a I3C NMR data base demonstrated the applicability of these methods even in the case of very unusual structural elements. The conformation of the compounds in solution is discussed with the help of arguments derived from coupling constants and intramolecular anisotropy effects.