Negi Devendra Singh, Negi Nisha, Kumar Ashok, Matsunami Katsuyoshi, Schulz Stefan, Jones Peter G
Department of Chemistry, HNB Garhwal University, Srinagar (Garhwal) 246 174, Uttarakhand, India.
Acta Crystallogr C. 2013 Jan;69(Pt 1):87-9. doi: 10.1107/S0108270112049657. Epub 2012 Dec 13.
Asarinin, C(20)H(18)O(6), was isolated as a racemate from the shrub Zanthoxylum alatum. Both forms of the enantiomerically pure substance, (+)- and (-)-asarinin, have been the subject of a total of five previous structure determinations that are essentially identical except for the absolute stereochemistry. However, there seems to be some confusion in the literature concerning these structure determinations of asarinin and also those of its stereoisomer sesamin. The molecular structure of racemic asarinin differs from that of the pure enantiomers in the orientation of one ring system. In the packing of the racemate, molecules are linked by C-H...O interactions to form ribbons parallel to [101].
山椒素（C₂₀H₁₈O₆）是从花椒属灌木中分离得到的外消旋体。对映体纯物质的两种形式，即（+）-和（-）-山椒素，此前总共进行了五次结构测定，除绝对立体化学外，这些测定结果基本相同。然而，关于山椒素及其立体异构体芝麻素的这些结构测定，文献中似乎存在一些混淆。外消旋山椒素的分子结构在一个环系的取向上与纯对映体不同。在外消旋体的堆积中，分子通过C-H...O相互作用连接形成平行于[101]的带状结构。
