Chemistry

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I would appeciate any help with identifying the chiral carbons, if any, in each of the following compounds:
OCH3
2. CH3--CH--CH3



OH O
11. CH3--CH--C--CH3
OH

12. CH3--C--CH3
OH

CH3 O
15.CH3--CH--C--CH3



Br
CH3--C--CH2--CH3
OH


thank you.

  • Chemistry -

    There is no way anyone can know what you have typed. As I pointed out in an earlier response, the board ignores any space after the first one you make; take a look at your post and you can see there is no way of knowing where the groups are attached that you have typed above and below the line. A a carbon to be chiral, it must have four different groups attached. That's easy enough to count without posting a question. An alternative is to try writing the condensed structure.

  • Chemistry -

    Ah, I see what you are talking about.

    OCH3 is above the CH
    ________________________

    OH O is above the CH
    Also OH is under the CH
    ________________________

    OH is under the C
    ___________________

    CH3 O is above the CH
    ____________________
    Br is above the C
    OH is under the C

    _____________________________________
    any help is appreciated. If it is four groups, then wouldn't all be chiral carbons?

  • Chemistry -

    #2 has no chiral center. Why? On the central C, there is an H, an OCH3, and TWO CH3 groups; therefore, it doesn't have four separate groups.

    #11. I can't figure out from your description. I think the OH under the ring probably goes on the C and not the CH.

    #12.No chiral center for the same reason as #2.

    15. Some of the C atoms don't have four bonds. If you meant
    CH3CH(OCH3)CH2CH3 (I have added H atoms to the #2 C atom from the right side), that C is chiral. It has a CH3, H, OCH3, and CH2CH3 which makes four different groups attached.

    last one is not numbered. It has a chiral center. There is a CH3, Br, OH, and CH2CH3; again four separate groups.

  • Chemistry -

    Hey, thanks a lot.

    Yes, sorry I did write those incorrectly.Here they are:

    11. CH3--CH--C--CH3

    OH is above the CH
    O is above the C
    _________________________________

    So 15. does have four separate groups?

    15. CH3--CH--C--CH3
    CH3 is above the CH
    O is above the C

  • Chemistry -

    Try writing them in this fashion.

    CH3-CH(OCH3)-CH3 [not chiral]

    CH3-CH(OH)-C(=O)-CH3 [chiral]

    CH3-C(OH)2-CH3 [not chiral]

    CH3-CH(CH3)-C(=O)-CH3 [not chiral]

    CH3-C(Br)(OH)-CH2-CH3 [chiral]

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