Identifying Cis/Trans

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Alex Nguyen 3I
Posts: 100
Joined: Fri Sep 25, 2015 3:00 am

Identifying Cis/Trans

Postby Alex Nguyen 3I » Sat Mar 12, 2016 1:56 am

Is cis and trans only found on double bonds and cycloalkanes with substituents (or is it only cyclohexane)? Also, how would you designate cis and trans for 3 substituents (if you can)?

Manraj Garewal 2L
Posts: 13
Joined: Fri Sep 25, 2015 3:00 am

Re: Identifying Cis/Trans

Postby Manraj Garewal 2L » Sat Mar 12, 2016 2:30 am

For the second part of your question, I believe you would designate cis and trans based off what the largest substituent. If they are all the same size, I do not believe there is a difference between cis and trans. However, if you have an ethyl substituent on one side of the double bond, and both an ethyl and a methyl substituent on the other side of the double bond, then cis/trans would be designated based on the ethyl substituent, because it is larger.

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