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Abstract
The NMR spectra of limonin, its congeners, and some of their derivatives are discussed. The results confirm the structures assigned to citrolin, limonexic acid, and many other degradation products of limonin. Stereochemical assignments are made to the 1-position in nomilin and the 17-position in obacunone on the basis of theire NMR spectra. This furfurylic proton at C 17 in limonin is compared with a similar protonin columbin. Evidence for an anisotropic shielding effect of the epoxy group is discussed.
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