Cis and trans Vs. Z and E

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zricciardulli
Posts: 12
Joined: Wed Sep 30, 2015 3:00 am

Cis and trans Vs. Z and E

Postby zricciardulli » Mon Mar 07, 2016 3:49 pm

are these prefixes interchangeable? For example is naming something "cis 2,4dimethyl pentane" the same as "E 2,4 dimethyl pentane"? I'm confused as when to use one versus the other.

Matthew Oh 3I
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

Re: Cis and trans Vs. Z and E

Postby Matthew Oh 3I » Mon Mar 07, 2016 3:50 pm

Yes they are the same, cis = Z, trans = E.

Carolyn Stephens 3H
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Re: Cis and trans Vs. Z and E

Postby Carolyn Stephens 3H » Fri Mar 11, 2016 12:06 am

cis/trans and z/e are interchangeable in concept regarding which side of the double bond each molecules rests on. However, they are not completely interchangeable in naming. It is important to note that cis/trans can ONLY be used when you are comparing 2 carbons and 2 hydrogens attached to the double bond, whereas Z/E can be used for any substituent, halogen, functional group, carbon chain, etc.

Samantha Rundle 3K
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

Re: Cis and trans Vs. Z and E

Postby Samantha Rundle 3K » Fri Mar 11, 2016 3:25 pm

Why is it inappropriate to use cis and trans when you are not using two carbons and two hydrogens?

Thank you!


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