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    Basically I am trying to answer this question in my revision guide which is to show the chiral carbon in limonene, I can't like upload the question but here is a picture of it:




    However my one issue is (ignore the fact that this one labels the chiral carbon), if I draw out limonene fully, that carbon doesn't seem chiral to me. It's attached to a carbon, a hydrogen but two of the groups seem to be -CH2. How is this chiral?
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    The -CH_2 are the same, but further along the chains are different(one has a double bond).
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    (Original post by morgan8002)
    The -CH_2 are the same, but further along the chains are different(one has a double bond).
    How do I know where one ends and the other finishes if they loop back to join eachother?
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    (Original post by Dinasaurus)
    How do I know where one ends and the other finishes if they loop back to join eachother?
    I think the simplest way is to consider each to be the whole loop. If we look at the + limonene, the double bond is before the fork on the clockwise loop and after the fork on the anticlockwise loop.
    You could instead only consider them until they join together.
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    (Original post by Dinasaurus)
    How do I know where one ends and the other finishes if they loop back to join eachother?
    Think not in terms of attachments, more in terms of a journey passing through all of the atoms that are attached.

    If all of the things that you see on a route are identical then the two routes are the same. But if one gets to a double bond before the other then they must be different.
 
 
 
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