NMR spectral assignment and conformation of macrocyclic biaryl ethers from Garuga gamblei

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Abstract
The assignment of the 1H and 13C NMR spectra of macrocyclic biphenyl ethers isolated from Garuga gamblei 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 13C 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.

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