Trans and Cis

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Kim Vu 2G
Posts: 29
Joined: Fri Sep 25, 2015 3:00 am

Trans and Cis

Postby Kim Vu 2G » Thu Feb 25, 2016 9:37 pm

Can you determine trans and cis geometric isomers just by using the line structure, if so, how would you do that? or would you have to draw out the lewis structure?

Deanna Necula 3B
Posts: 62
Joined: Fri Sep 25, 2015 3:00 am

Re: Trans and Cis

Postby Deanna Necula 3B » Thu Feb 25, 2016 10:50 pm

I think you can determine it from the line structure. It just depends on the location of the highest-priority substituents attached to the sp2 carbon. If they're opposite each other, then the molecule is trans. If they're on the same side, the molecule is cis.

JudithGonzalez_1G
Posts: 13
Joined: Fri Sep 25, 2015 3:00 am

Re: Trans and Cis

Postby JudithGonzalez_1G » Fri Mar 04, 2016 5:44 pm

Yeah you can see if it's trans or cis by looking at both the line structure or the lewis structure, it's just not as easily noticeable in a line structure as it is in a lewis structure. In the line structure, you look at the attachments to the carbon at either side of the double bond, and you keep going until you reach substituents that aren't hydrogen. Then you compare the substituents on either side of the double bond and see whether they are on the top or on the bottom of the line structure to determine whether they are cis or trans.


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