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Topic: Help with (E)-(Z) System  (Read 2804 times)

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Offline HuàXué

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Help with (E)-(Z) System
« on: October 27, 2009, 11:48:45 PM »
When assigning priorities, do we follow the same rules as the rules in the R/S-designation?

Offline Scatter

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Re: Help with (E)-(Z) System
« Reply #1 on: October 28, 2009, 03:16:32 AM »
Only in the fact that you assign priority based on the atoms that are directly bonded to the carbons, working outwards if they are the same.

With R and S designation you are assigning 4 different priorities (1-4) around a chiral center and with E Z designation you are assigning two priorities on each half of a double bond (high or low).  If someone cares to explain that better, please do, I'm a student too.
« Last Edit: October 28, 2009, 03:28:10 AM by Scatter »

Offline movies

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Re: Help with (E)-(Z) System
« Reply #2 on: October 28, 2009, 11:13:43 AM »
Yes, the order you give to groups is exactly the same for E/Z and R/S.  The comparisons you make are a little different, as Scatter pointed out, but when determining which group has the highest priority, the method is the same.

Offline tinapratiwi

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Re: Help with (E)-(Z) System
« Reply #3 on: November 01, 2009, 08:41:35 PM »
I think the explanation of the Scatter already includes all.

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