立体异构
![](/Images/godic/202502/13/DL-tartaric_acid2056.png")
![Isómeros conformacionales de la molécula de etano, mostrando la diferencia de energía entre las conformaciones alternadas y eclipsada.](/Images/godic/202502/13/Ethane_conformers2056.jpg")
![Diferentes configuraciones del ácido tartárico. Los dos superiores son enantiómeros. Los dos inferiores son equivalentes (forma meso). Cualquiera de las estructuras superiores es un diastereoisómero de las estructuras inferiores. La mezcla en proporciones iguales (1:1) de las formas dextro y levo forma un racémico o mezcla racémica, sin actividad óptica.](/Images/godic/202502/13/Weinsaeure_enantiomere_mesoform-Tartaric-acid-stereoisomers.svg2056.png")
![Isómeros de configuración absoluta R y S.](/Images/godic/202502/13/RS_isomer2056.png")
根据IUPAC金色书的定义，立体异构体是指具有相同原子连接顺序，但原子在空间排列不相同的同分异构体。这种异构现象称为立体异构。具有不同光学性质的立体异构体又称光学异构体，但“光学异构”一词是IUPAC不推荐的用法。
以前将立体异构划分为几何异构、旋光异构和构象异构三类，但目前较好的分类是将其分为对映异构和非对映异构两类，其中非对映异构又包括顺反异构（即几何异构）和构象异构。
stereoisomerism
/ˌsteriəuai'sɔmərizəm/ /ˌstɛrioaɪˈsɑməˌrɪzəm/
英汉-汉英词典
立体异构;立体异构现象
词组 | 习惯用语
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- consumerism n. 商品的消费和销售性服务；消费主义；用户至上主义
- stereoisomer n. 立体异构术
- seismometer n. 地震检波器
- consumerist 消费主义
stereoisomerism n. 立体异构现象
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英语百科
Stereoisomerism 立体异构
![The different types of isomers. Stereochemistry focuses on stereoisomers.](/Images/godic/202502/13/Isomerism.svg2056.png")
![](/Images/godic/202502/13/Meso-Weinsäure_Spiegel.svg2056.png")
![](/Images/godic/202502/13/Fluoromethylpentene2056.png")
Stereoisomers are isomeric molecules that have the same molecular formula and sequence of bonded atoms (constitution), but differ in the three-dimensional orientations of their atoms in space. This contrasts with structural isomers, which share the same molecular formula, but the bond connections or their order differs. By definition, molecules that are stereoisomers of each other represent the same structural isomer.
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