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stereogenic centers?

Discussion in 'MCAT Discussions' started by 134317, Apr 8, 2007.

  1. 134317

    134317 Guest

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    Jan 27, 2007
    [​IMG]
    Lovastatin


    I have a Kaplan book that says the carbon at the double ring barrier with the hydrogen coming out of the page is a stereogenic center.

    I think this is wrong, because since it has two hydrogens attached to it, it can't possibly be a chiral center (I learned that it has to have four different things attached). Can anyone confirm this or explain where I'm wrong?

    Thanks.
     
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  3. MSTPbound

    MSTPbound student Moderator Emeritus 2+ Year Member

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    Oct 1, 2006
    It only has one hydrogen attached to it. The other three attachments are two sp3 carbons and one sp2 carbon. And yes, it is chiral.
     
  4. 134317

    134317 Guest

    28
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    Jan 27, 2007
    Thanks. I'm an idiot. I imagined a second hydrogen there.
     
  5. MSTPbound

    MSTPbound student Moderator Emeritus 2+ Year Member

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    0
    Oct 1, 2006
    No problem. And you're not an idiot. Half the time the hydrogens are invisible, right? So it can get tricky keeping track of when they're NOT there... especially as molecules get more complex.

    Cheers,

    -MSTPbound
     

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