A correlation between voacarpine (I) and 16‐épivobasine (II) establishes the absolute configuration at C5and C15and the geometry of the ethylidene side chain in voacarpine and in Nβ‐methylvoacarpine (VI). This last base is shown to be identical with Le Men's vincadiffine.
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Braekman et al. (1966) studied this question.
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