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Book says threonine has chiral center in its sidechain? How?

  1. Nov 24, 2015 #1
    Text says that threonine and isoleucine have a chiral carbon in sidechain. Im not seeing it.

    The carbon in the sidechain that is next to the alpha carbon is attached to an oxygen, a hydrogen, a carbon (a methyl group) and the alpha carbon. So that means its attached to two carbons, so therefore it doesnt have 4 different substituents attached so therefore its not chiral.
    Its probably something to do with me not grasping definition of chiral im geussing, ..
    do you consider the atoms attached or is it the substituents that must be different for chirality? For example, would CH and a CH2 be considered two different substits?
    thanks
     
  2. jcsd
  3. Nov 24, 2015 #2

    Ygggdrasil

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    Science Advisor

    The substituents must be different, so the methyl group and alpha carbon count as two different substituents.
     
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