1. The SDN iPhone App is back and free through November! Get it today and please post a review on the App Store!
    Dismiss Notice
  2. Dismiss Notice
  3. Guest, be sure to check out How To Get Into Dental School, our free downloadable PDF with step-by-step details for dental school applicants!
    Dismiss Notice
  4. Dismiss Notice
Dismiss Notice

Interview Feedback: Visit Interview Feedback to view and submit interview information.

Interviewing Masterclass: Free masterclass on interviewing from SDN and Medical College of Georgia

orgo question help!

Discussion in 'Pre-Dental' started by docs87, Aug 16, 2011.

  1. docs87

    2+ Year Member

    Joined:
    Feb 20, 2011
    Messages:
    97
    Likes Received:
    0
    hey im confused how the methyl is directing orth/para?
    help
     

    Attached Files:

  2. Note: SDN Members do not see this ad.

  3. LaughingGas

    7+ Year Member

    Joined:
    May 17, 2010
    Messages:
    1,712
    Likes Received:
    428
    Status:
    Dental Student
    To be ortho/para, the side groups always donate electrons, making the benzene more susceptible for electrophilic attack, aka activating groups.
    Methyl groups donate their electrons by hyperconjugation (refer to ur ochem txtbook or wiki). Electrons in the C-H can temporarily jump in to the p orbital or benzene.
     
  4. docs87

    2+ Year Member

    Joined:
    Feb 20, 2011
    Messages:
    97
    Likes Received:
    0
    but isnt the Br in a meta position?
     
  5. AlbinoPolarBear

    7+ Year Member

    Joined:
    Jun 18, 2011
    Messages:
    1,607
    Likes Received:
    303
    Look at the relative substituents in a molecule.

    Electron donating groups will direct the Br ortho and para.
    CH3 is a donating group.
    Br will be either ortho or para to the CH3 group.

    Electron withdrawing groups will donate the Br to the meta position.
    COOH is a withdrawing group.
    The Br will be in the meta position compared to the COOH group.

    The answer given fits these criterias.
     
  6. docs87

    2+ Year Member

    Joined:
    Feb 20, 2011
    Messages:
    97
    Likes Received:
    0
    oh i see, so its relative to the directing group thx
     

Share This Page