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Homework Help: Organic Chemistry: No. of chiral centres in Camphor

  1. Mar 19, 2010 #1
    Hello. I have a query regarding organic chemistry.

    1. http://tinyurl.com/y9nvg2p
    See question number 21.




    2. Relevant equations: None



    3. The first Carbon atom beneath the top-most CH3 group I can tell is a chiral centre, as it has 4 different groups attached to it (C=O, CH2, CH3, C). Apparently the answer is C, i.e 2 chiral centres. I can't locate the second one.

    Thanks.
     
  2. jcsd
  3. Mar 21, 2010 #2

    danago

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    How about the bottom-most carbon atom?
     
  4. Mar 21, 2010 #3
    That's the answer, but I couldn't put together a solid reasoning. Normally chiral compounds that we're supposed to identify have, I don't know what to call it, terminal ends? E.g, like the chiral carbon would be bonded to H, OH, CH3, CO2H. That ring confused me. Taking the entire ring as a group, that Carbon is attached to the same group on both the ends.
     
  5. Mar 21, 2010 #4

    danago

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    Gold Member

    You can do a similar kind of analysis even though it is a ring. If you look at the group directly either side of the bottom carbon, they are indeed the same (-CH2), however if you move along and look at the next group, it is a CH2 on the left side and a C=O on the right side i.e. The ring is not symmetrical, so you can kind of think of it as being bonded to 4 different groups.
     
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