E v. Z for 1,1-bromo-chloro-propene

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Kaitlin Ross 3E
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E v. Z for 1,1-bromo-chloro-propene

Postby Kaitlin Ross 3E » Sun Mar 13, 2016 12:43 am

The diagrams at the bottom of page 106 in the course reader show two different versions of 1,1-bromo-chloro-propene where one is E and the other is Z but the bromo and chloro groups are both on the left hand side of the diagram. How does switching the positions of the H and CH3 on the right hand side affect whether the substituents are E or Z?

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Re: E v. Z for 1,1-bromo-chloro-propene

Postby Chem_Mod » Sun Mar 13, 2016 12:45 am

You want to compare the largest substituent on the left hand side with the largest substituent on the right hand side. In this case, since Br is bigger than Cl, the Br is higher priority. On the right side, since CH3 is bigger than H, the CH3 is higher priority. So now you're comparing the Br with the CH3, and whether they're on the same side or whether they're diagonal to each other will determine if they're cis or trans


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