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Geometric Isomers

Posted: Sun Feb 28, 2016 8:58 pm
by Tiffany Chen 2E
On page 17 of the Intro to Organic Chemistry textbook, how do you distinguish between the (E)-3,7-Dimethylocta-1,3,7-triene and (Z)-3,7-Dimethylocta-1,3,7-triene isomers? I'm thinking you start comparing at the 3 C double bond but don't know what to do beyond that? Thanks!

Re: Geometric Isomers

Posted: Sun Feb 28, 2016 10:12 pm
by Chem_Mod
E, Z system only applies to double bond. In a double bond, if two priority groups are pointing in the same direction (up or down) it is a Z otherwise it is E. Priority is determined by atomic number; the higher the atomic number, the higher the priority.