Crystal Research and Technology
Cryst. Res. Technol. 35 (2000) 355 - Abstract -

P. Luger, M. Weber, N. X. Dung*, P. H. Ngoc**, D. T. Tuong**, D. D. Rang**

Institut für Chemie/Kristallographie, Freie Universität Berlin, Germany
*Centre for Education and Development of Chromatography of Vietnam
**National Center for Natural Sciences and Technology, Hanoi, Vietnam

The Crystal Structure of Hop-17(21)-en-3β-yl acetate of Pluchea pteropoda Hemsl. from Vietnam

C32H52O2 (293K): monoclinic space group C2, a= 13.227(7), b= 6.600(1), c= 32.514(2) Å, β=96.18(5)°, V= 2821.9(16) Å3, Dx= 1.103 gcm-3, Z= 4, F(000)= 1040, &lamda;(CuKα)=1.5418 Å, µ= 0.499 mm-1. The title compound isolated from the roots of a Vietnamese plant and being known for its activity against fever was identified by this X-ray analysis to be a pentacyclic triterpene of hopanoide type with a C17=C21 endocyclic double bond in the five membered ring. The presence of several axially substituted methyl groups on both the α and β side causes the so called "mid-molecule strain" having already been reported in the literature for other hopane type ring systems.

Keywords: crystal structure, vietnamese plant


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