Notices
Results 1 to 6 of 6

Thread: Meta-Deactivator ?

  1. #1 Meta-Deactivator ? 
    Forum Junior ArezList's Avatar
    Join Date
    Mar 2008
    Posts
    229
    In an organic Chemistry book on the part of aromatic compounds, it's said"Meta-directing groups are all deactivating..."

    What does the"activating and deactivating" mean here....? we know there's some reactions result in meta-product as the the majority, then how come to be deactivating? What a mess! who can help?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Freshman Neecze's Avatar
    Join Date
    Jul 2006
    Location
    Torun, Poland
    Posts
    17
    If some substituent is activating, it means that aroamtic ring with this substituent reacts faster (and more easily) than benzene itself.

    And if some substituent is deactivating it means that aromatic ring with this substituent reacts more slowly than benzene itself.


    Reply With Quote  
     

  4. #3  
    Forum Junior ArezList's Avatar
    Join Date
    Mar 2008
    Posts
    229
    then how come to say "Meta-directing groups are all deactivating..." "
    Reply With Quote  
     

  5. #4  
    Forum Freshman
    Join Date
    Feb 2008
    Location
    Ukraine
    Posts
    6
    Metadeactivator - enzyme.
    Reply With Quote  
     

  6. #5  
    Forum Junior ArezList's Avatar
    Join Date
    Mar 2008
    Posts
    229
    I don't get it,,,,,,,,,

    How come that meta-directing %%&*^*&^ are all deactivator?
    Reply With Quote  
     

  7. #6  
    Moderator Moderator AlexP's Avatar
    Join Date
    Jul 2006
    Location
    NY
    Posts
    1,838
    There are three prefixes used to distinguish the positions of substituents relative to each other on, for example, a benzene ring; they are ortho-, meta-, and para-. If your book says that "meta-directing groups are all deactivating," it may be trying to say that compared to rings with substituents in the ortho- or para- positions, rings with substituents in the meta- position are not active. I've read about this, but I can't remember the exact details, i.e. if a meta- form is indeed less reactive. However, I'm guessing this is what the book is trying to say. As for why specifically the meta- form is deactivating...I've read that, but it's beyond me to explain here...
    "There is a kind of lazy pleasure in useless and out-of-the-way erudition." -Jorge Luis Borges
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •