xwinorb
Hazard to Others
Posts: 100
Registered: 9-8-2005
Member Is Offline
Mood: No Mood
|
|
Hexamine from Esbit tablets
I would like to know if hexamine from Esbit tablets would be OK to use in a sulfuric modified Duff formylation as proposed by Ullman.
Does the waxy binder causes any problems ?
I have used it for other things, the hexamine from Esbit tablets works very well to make methylamine.HCl, for instance, it is not necessary to
separate the waxy binder.
I rather use the Esbit, 1.5 packs provide circa 250 g of hexamine, one less chemical to store in bulk.
Just in case, I will post the results of the formylation when I do it. Most probably next year, I am busy with work and other things
|
|
|
crazyboy
Hazard to Others
Posts: 436
Registered: 31-1-2008
Member Is Offline
Mood: Marginally insane
|
|
You might be able to get away with it but in general it is never a good idea to use reagents with unknown quantities of inert compounds and binders. I
would try to purify it, however if you try recrystallization which is the simplest way you may have a hard time getting it dry.
|
|
|
spirocycle
Hazard to Others
Posts: 197
Registered: 29-9-2010
Member Is Offline
Mood: No Mood
|
|
dont those tablets usually have hexamine AND trioxane?
|
|
|
hissingnoise
International Hazard
Posts: 3940
Registered: 26-12-2002
Member Is Offline
Mood: Pulverulescent!
|
|
Quote: Originally posted by crazyboy  | | I would try to purify it, however if you try recrystallization which is the simplest way you may have a hard time getting it dry.
|
Hexamine is easy to prepare by simply mixing CH2(OH)2 and an excess of NH4OH.
I've never had problems with evaporation to dryness!
|
|
|
xwinorb
Hazard to Others
Posts: 100
Registered: 9-8-2005
Member Is Offline
Mood: No Mood
|
|
I have once looked at the tablets composition information from Esbit, I think they say it is only hexamine and an inert ingredient, but don't mention
in what proportion.
I have used it to make methylamine, and I had no problems, and I have seen posted that it is not necessary to remove the waxy binder. After reacting
it shows up as a white coating on the inside of the boiling flask. It is easy to remove with acetone.
If someone knows more than I do please post.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
