Cis and Trans

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Cis and Trans

Postby GabrielaGutierrez2A » Wed Mar 15, 2017 4:38 pm

When dealing with cis and trans, does it refer to any substituents? Or must the substituents be identical? If they are not the same, do the same rules apply as with E and Z (the higher atomic # having priority)?

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Re: Cis and Trans

Postby Chem_Mod » Wed Mar 15, 2017 4:50 pm

Yes, you are correct.

If there are only two substituents, you use the cis/trans naming system. You can also use E/Z for two substituents.
If there are more than two substituents, you use the E/Z naming system, only considering the two highest priority substituents.

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