chemistry cis and trans

TodayIsGift

2013-04-14 1:26 am

圖片參考：http://imgcld.yimg.com/8/n/HA01132001/o/20130413172508.jpg

I want to ask is this two cis- and trans- wrong? Since the CH3 is on the same side but it is trans, the CH3 is on different sides but it's cis-, please help me~~~~

回答 (1)

wanszeto

2013-04-14 8:03 am

✔ 最佳答案

There are one -CH3 group and one H atom on the left, the -CH3group has a higher atomic number.
There are one -CH2CH3 group and one -CH3 groupon the right, the -CH2CH3 group has a higher atomicnumber.

The isomer on the left hand side :
The two groups of higher atomic number (i.e -CH3 on the left and -CH2CH3on the right) are both on the same side. Hence, it is a cis- isomer.

The isomer on the right hand side :
The two groups of higher atomic number (i.e. -CH3 on the left and-CH3CH3 on the right) are on the opposite sides. Hence,it is a trans- isomer.

參考: wanszeto

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