Cis vs Trans

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Donavin Collins 1F
Posts: 66
Joined: Sat Sep 14, 2019 12:16 am

Cis vs Trans

Postby Donavin Collins 1F » Sun Dec 08, 2019 10:09 am

What's the difference between cis and trans in chemistry? I've seen it around (like cisplatin and transplatin) but haven't really covered it yet.

Chem_Mod
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Re: Cis vs Trans

Postby Chem_Mod » Sun Dec 08, 2019 10:15 am

Not necessary to know for this class but in an alkene, ie HCH3C=CCH3H, cis has the identical attachments on the carbons on the same side, trans has them on opposite sides

Daniel Toscano 1L
Posts: 95
Joined: Tue Nov 13, 2018 12:18 am

Re: Cis vs Trans

Postby Daniel Toscano 1L » Sun Dec 08, 2019 10:16 am

cis means the same ligands are on the same side while trans means the same ligands are across from each other, separated by the central atom.
The terms tell us about the compound's geometry

Sydney Pell 2E
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Joined: Wed Sep 11, 2019 12:17 am

Re: Cis vs Trans

Postby Sydney Pell 2E » Sun Dec 08, 2019 10:24 am

An example of this that was used in class is cisplatin and transplatin. In cisplatin, the Cl atoms are on one side of the central Pt and the NH3 molecules are bonded the opposite side. In transplatin, one Cl and one NH3 switch places so that the Cls and NH3s are diagonal from each other instead of side-by-side.


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