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Kaplan Ochem Flashcard error?

Discussion in 'DAT Discussions' started by Futureortho24, Jul 17, 2006.

  1. Futureortho24

    Futureortho24 Member
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    Hello everyone! Question - in the kaplan flashcards, O34 says T/F the reduction of an alkyne on a metal surface (pd) results in a cis alkene

    I thought that was true, but the answer on the flashcard says it is false that it forms an alkane! Am I mistaken or is there an error on the card?

    THANKS!!
     
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  3. messenger

    messenger Senior Member
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    it is so an error. :)
     
  4. Futureortho24

    Futureortho24 Member
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    WOO HOO! Thanks :)
     
  5. asckwan

    asckwan Member
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    Sorry to burst the bubble here, but the flash card is right. Only when paired with a "poison catalyst" (Lindlar's catalyst) or only one equivalent of H2 and Pt will it stop at a cis alkene or else it is potent enough to continue on. Hope that helps out.
     
  6. Rook

    Rook Guest

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    Not an error
    Asckwan is 100% correct
     
  7. Futureortho24

    Futureortho24 Member
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    I never heard of that - Thanks for the info! It is ok Messenger, I thought there really was an error! I will have to keep this in mind that ONLY when paired with a poison catalyst it reacts in the way I first thought!

    Thanks guys!
     
  8. slayerdeus

    slayerdeus Member
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    Yea, sometimes you gotta sit back and remember that you are on a forum which anyone can reply to you. The flashcard is indeed correct. When reducing an alkyne using H2/platinum it is syn addition but it doesn't stop at the alkene, it goes all the way through to the alkane.
     
  9. dat_student

    dat_student Junior Member
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    There is a hidden assumption: you have an excess amnt of H.
     

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