1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Sn2 mech concepts

  1. Feb 27, 2015 #1
    1. The problem statement, all variables and given/known data
    Hi folks! :)
    I have a problem with the following problem.
    Take any methyl halide and prepare methyl iodide.Choose the appropriate solvent.

    Now what i know is here we are going by SN2 mech and replacing a halide by iodide ion.But the problem i am facing is how can i replace a other halide by a iodide ion because my book says iodide is the best leaving group among all halides.So i am confused how will this happen. ???
  2. jcsd
  3. Feb 27, 2015 #2
    Yes, iodide is the best leaving group. But the solvent can make the difference. For example, the Kharasch addition in the presence of H2O2 breaks the Markonikov's rule. I'm sorry I don't have the details of this reaction, but will check into it.
  4. Apr 9, 2015 #3
    You can do a displacement reaction with methylbromide:

    CH3Br + KI ----> CH3I + KBr

    You might want to use an aprotic solvent such as DMSO, DMF or acetone.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted