Beryllium
Harmless
Posts: 6
Registered: 23-10-2007
Member Is Offline
Mood: No Mood
|
|
Iodomethane Synthesis
An idea for the synthesis and isolation of iodomethane came to me today. Please correct me on any mistakes and give your opinion/advice. 
Numbers aren't worked out, I'm looking for input as to the viability of the method as a whole.
NaI/KI + Phosphoric Acid in water. Add methanol until iodide is consumed.
As MeI is not especially soluble in water(14g/L@20C), the water and the MeI would separate as the methanol is consumed. The MeI could then be isolated
via separatory funnel.
Thoughts?
Edit- 'doh, not enough sleep!
[Edited on 6-1-2008 by Beryllium]
[Edited on 7-1-2008 by Beryllium]
|
|
|
Maja
Hazard to Others
Posts: 143
Registered: 27-2-2006
Member Is Offline
Mood: No Mood
|
|
Iodomethane is very very volatile bp 40C. Refluxing for some time H3PO4 + NaI + Methanol works well. Iodomethane also is very toxic.
|
|
|
Beryllium
Harmless
Posts: 6
Registered: 23-10-2007
Member Is Offline
Mood: No Mood
|
|
| Quote: | Originally posted by Maja
Iodomethane is very very volatile bp 40C. Refluxing for some time H3PO4 + NaI + Methanol works well. Iodomethane also is very toxic.
|
Any idea as to the duration of reflux or yield?
|
|
|
Maja
Hazard to Others
Posts: 143
Registered: 27-2-2006
Member Is Offline
Mood: No Mood
|
|
Try to search. I tried. https://sciencemadness.org/talk/viewthread.php?tid=7570&...
|
|
|
Beryllium
Harmless
Posts: 6
Registered: 23-10-2007
Member Is Offline
Mood: No Mood
|
|
Ah, I searched, but not for methyl iodide. Thanks for the assistance.
|
|
|
Klute
International Hazard
Posts: 1378
Registered: 18-10-2006
Location: France
Member Is Offline
Mood: No Mood
|
|
Be carefull! This a very noxiuous compound! Work under an efficient fume hood, no bare skin, and even a suited gas mask would adviseable.
It's the kind of stuff you don't want to take a wiff of. I will kill you years after (cancer) if it doesn't immediatly. The ease in which it can be
made must not make you forget how dangerous it is.
Be safe.
|
|
|
Tsjerk
International Hazard
Posts: 3022
Registered: 20-4-2005
Location: Netherlands
Member Is Offline
Mood: Mood
|
|
iodomethane
There will be no di-iodo-methane formed in this synthesis. Neither will methane. But it's advisable to use cooled water in your condensor if you
reflux.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
