1H NMR Spectra of Some Tetracyclic and Pentacyclic 3β-Monoacetoxytriterpenes with Eu (dpm) 3

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Abstract
The 1H NMR spectra of the acetyl derivatives of six types (lanostane, cycloartane, cucurbitane, dammarane, euphane, and tirucallane types) of tetracyclic and eleven types (ursane, ψ-taraxastane, oleanane, taraxerane, multiflorane, lupane, fernane, hopane, arborinane, adianane, and glutinane types) of pentacyclic 3β-monohydroxy triterpenes were examined in the presence of tris (dipivaloyl-methanato) europium [Eu (dpm)3], a lanthanide shift reagent. Assignments of their methyl resonances were made. Furthermore, lanthanide-induced shifts, expressed in terms of relative ΔEu-values, of the methyl resonances of the 3β-monoacetoxy triterpenes determined in this study were found useful for characterizing and distinguishing these compounds from each other.

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