构型异构中的顺反异构 o Cis-trans isomers result from restricted rotation that can be caused ether by a double bond or by a cyclic structure
二、构型异构中的顺反异构 z Cis–trans isomers result from restricted rotation that can be caused ether by a double bond or by a cyclic structure
1. Cis-trans isomers caused by double bond H2C CHCH Hrc H C=C H CHCH cis-2-pentene trans-2-pentene Cis-2-pentene trans-2-pentene
1. Cis-trans isomers caused by double bond
2. Cis-trans isomers caused by cyclic structure Br H Br CI c cis-1-bromo-3-chlorocyclobutane trans-l-bromo-3-chlorocyclobutane H H CH 3 CH 3 CH3 CH 3 H cis-1, 4-dimethylcyclohexane trans-1, 4-dimethylcyclohexane
2. Cis-trans isomers caused by cyclic structure H Cl H Br H Cl B r H H CH 3 H CH 3 H CH 3 CH 3 H cis-1-bromo-3-chl orocyclobutane t rans-1-bromo-3-chlorocyclobutane cis-1,4-di m ethy lcyclohexane trans-1,4-di m ethy lcyclohexane
构型异构中的对映异构和非对映昇构 1.偏振光、光学活性及旋光度 1.1偏振光( plane-polarized light) 普通光在通过尼克尔棱镜后形成的只在一个方向 传播的平面光 direction of light propagation normal polarIzer plane-polarized light
三、构型异构中的对映异构和非对映异构 1. 偏振光、光学活性及旋光度 1.1 偏振光 ( plane-polarized light ) —— 普通光在通过尼克尔棱镜后形成的只在一个方向 传播的平面光
构型异构中的对映异构和非对映异构 12光学活性( optical activity) 物质能使偏振光发生偏转的性质。 direction of light propagation normal polarizer plane-polarized sample tube plane-polarized light light containing a light chiral compound the plane of polarization has been rotated
三、构型异构中的对映异构和非对映异构 1.2 光学活性 ( optical activity ) —— 物质能使偏振光发生偏转的性质