Cis- versus Trans-

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HoganFenster2E
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Joined: Fri Sep 25, 2015 3:00 am

Cis- versus Trans-

Postby HoganFenster2E » Fri Feb 26, 2016 2:04 pm

When do we indicate when an organic compound is Cis or Trans? In all of the solutions for chapter one it is never really indicated.

Chem_Mod
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Re: Cis- versus Trans-

Postby Chem_Mod » Fri Feb 26, 2016 3:52 pm

Briefly, when you have 2 identical molecule/group on different sides of the double bond, it is trans and if they are on the same side, it is cis. Picture sources: wikipedia Image

Richmund Tan 1L
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Joined: Fri Sep 25, 2015 3:00 am

Re: Cis- versus Trans-

Postby Richmund Tan 1L » Fri Feb 26, 2016 4:16 pm

Additionally, cis- and trans- can refer to bonds in 3-dimensional space. If identical bonds are facing in the same direction of the z-axis (given the positive z axis points towards you), the bonds would be considered cis-. However, if one bond points in the positive z direction and the other bond points in the negative z direction, this would be considered a trans- bond.


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