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    Hi I am wondering where the nitro group attaches to the ring? because I don't understand how you are meant to know which position
    thanks
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    (Original post by Carrotmail)
    Hi I am wondering where the nitro group attaches to the ring? because I don't understand how you are meant to know which position
    thanks
    Groups attached to the benzene ring 'direct' subsequent groups to specific carbon atoms on the ring.

    The reason for this lies in the stability of the intermediates formed during the substitution mechanism.

    In this case the methyl group tends to direct to the 2,4,6 (assuming methyl is on carbon #1) positions

    You have two methyl groups doing the same thing here.

    Hence 1,3-dimethyl will direct towards the 2,4,6 positions. However the 2-position will substitute only with difficulty due to steric hindrance (surrounded by methyl groups) so that leaves the 4,6 positions, which are essentially the same position (flip the molecule over), so the substitution will be there.
 
 
 
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