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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Reproduktor on March 27, 2022, 03:27:15 AM

Title: Stereoizomery
Post by: Reproduktor on March 27, 2022, 03:27:15 AM
I need someone, who can explain me , why the stereoizomery in this compound is "(S)" and not "(R)"? I tried to figure it out by myself, but it always end up being (R) for me, so I must be doing something wrong.
Title: Re: Stereoizomery
Post by: sjb on March 27, 2022, 05:49:59 AM
How are you assigning each of the branches?
CN(C)CCC[C@@]1(C2=C(CO1)C=C(C=C2)C#N)C3=CC=C(C=C3)F
Title: Re: Stereoizomery
Post by: Reproduktor on March 27, 2022, 06:50:44 AM
Branch with oxygen - 1, fluorine - 2, dimethylamino group - 4 and the branch on the left side - 3.
That means from 1 - 3 it is counterclockwise ( which is "S" stereoizomery) but since there is 4th substituent "coming forward" (the branch containing dimethylamino group)- you're supposed to switch the "S" to "R", am I right?