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R/S Configuration of Compounds

  1. Nov 24, 2012 #1

    AGNuke

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    I got this problem today in my International Chemistry Olympiad Paper, quite bugging me this question, so I am better off asking it.

    My question is, which of the following has R configuration?

    ICho.png


    From what I tried, I got both of them as S, and the remaining two options being confirmed S. I got it wrong, but it wouldn't hurt (or it would) to know the right answer.
     
  2. jcsd
  3. Nov 27, 2012 #2

    chemisttree

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    Were they drawn like this? Usually the two groups in the plane of the paper are adjacent rather than opposite as BOTH of these structures are! Redraw them correctly and the answer will present itself.
     
  4. Nov 28, 2012 #3

    AGNuke

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    Yes, they were drawn like this. That's why it posed a problem to me.
     
  5. Nov 28, 2012 #4

    chemisttree

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    So, redraw them and the answer will be obvious.
     
  6. Nov 29, 2012 #5

    AGNuke

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    Alright, after a lot of struggle, I reached the conclusion that 1st one is R.
     
  7. Nov 29, 2012 #6

    chemisttree

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  8. Nov 30, 2012 #7

    AGNuke

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    UPDATE : In the answer key released by my institute, the answer mentioned is the second one... :confused:
     
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