Abstract
An alkaloid, C20H35N3, mp 113–114 ° C, isolated fromHovea linearis R. Br., was shown to be an optically active 16-epiormosanine, [α]D = 0.0 ° in ethanol. It crystallizes in the orthorhombic space groupP212121, with unit cell dimensionsa = 11.939(1),b = 14.143(1),c = 22.310(2) Å,Z = 8, and the two molecules in the asymmetric unit are of the same chirality. The x-ray crystal structure was solved by direct methods and refined, using difference and least-squares procedures, with 2516 intensities (I > 3σ I ) measured with CuKα radiation on a single-crystal diffractometer. The final refinement of the fractional coordinates and isotropic thermal parameters of the nonhydrogen atoms, with all the hydrogens included, yielded anR index of 0.082. The molecule of 16-epiormosanine resembles the related alkaloid podopetaline in the conformation of the fused ring system.
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Mackay, M.F., McCall, M.J. & Poppleton, B.J. Crystal and molecular structure of an optically active 16-epiormosanine. Journal of Crystal and Molecular Structure 6, 125–137 (1976). https://doi.org/10.1007/BF01200580
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DOI: https://doi.org/10.1007/BF01200580