The meliacins (limonoids). Tris(dipivalomethanato)europium-induced upfield and downfield shifts in the nuclear magnetic resonance spectra of the meliacins

Abstract
The methyl signals in the n.m.r. spectra of a number of meliacins have been assigned by the use of tris(dipivalomethanato)europium-induced shifts. While most of the compounds examined gave downfield shifts, both down-field and upfield shifts were observed for 3-deacetylkhivorin.

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