儿茶素(Catechin)是黄烷—3—醇化合物,具有2—苯基苯并吡喃核的基本结构.[式Ⅰ]。A、B 环是芳香环,C 环是含氧杂环。式Ⅰ为表儿茶素,在我国文献资料中称为 L—表儿茶素(缩写 L-EC)。国外文献资料中却多用(-)-EC 表示,这两种书写式有没有差异?究竟那一种较为妥当?要了解这个问题,就需要知道有关儿茶素的手性、构型和旋光 Catechin is a flavan-3-ol compound having the basic structure of 2-phenylbenzopyran nucleus. A, B ring is an aromatic ring, and C ring is an oxygen-containing heterocyclic ring. Form I epicatechin, in our literature called L-epicatechin (abbreviated L-EC). However, there are many foreign literature (-) - EC said that there is no difference between these two writing? Which one is more appropriate? To understand this problem, we need to know about the chirality of catechin, configuration and rotation