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- W2094343169 abstract "Ajmaline, because of its availability and facile transformations, remains the compound of choice as a convenient material for partial synthetic work. When crude ajmaline from Rauwolfia vomitoria is purified by crystallization, there remains an amorphous residue that yields a crystalline hydrochloride. The investigation of this material has revealed it to be a mixture of ajmaline, isoajmaline, sandwicine, and isosandwicine, which are very difficult to separate. The method of isolation adopted is to crystallize fractionally the crude hydrochlorides from acetone. Some evidence concerning the steric effect of the 21-hydroxyl on the quinuclidine nitrogen of ajmaline has resulted from a study of the rate of the alkylation of derivatives and epimers. The conclusions reached were in accord with the accepted structure. The rate of ethiodide formation has been found to show distinct differences as can be seen from the results obtained from runs with the pairs of isomers. In all cases, there was greater hindrance to ethiodide formation for the iso derivative." @default.
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- W2094343169 date "1968-01-01" @default.
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- W2094343169 title "Chapter 2 The Ajmaline-Sarpagine Alkaloids" @default.
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- W2094343169 doi "https://doi.org/10.1016/s1876-0813(08)60114-1" @default.
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