For everyone running into green,red or purple MMC on DCM

[TheVacuumGuy]

You will often get these comments or questions:

• Unreacted methylamine ?
• Unreacted bromoketone ?
• Acid added too fast ?
• Temps too high ?
• Bad XYZ?​

The answer to above questions is : probably not.

The colorations are caused by acidification in acetone. How and why is yet to be determined.

I've tested this multiple times, by dividing the freebase in 2 equal portions and using different solvent for acidification.

In acetone i could throw away 4 out of 5 because of green/red/purple.
Other solvent yielded 5 / 5 perfect white.

Video/photo's will follow

 

[Kiteretsu_D]

So what solvent do you recommend other then acetone?

 

[TheVacuumGuy]

I wouldn't recommend anything yet, since i'm talking about specifically the colorization issue. Using different solvents pose other problems further up, But in this case it is ethyl acetate

 

[Throw-off]

So what solvent do you add into the MMC freebase.

 

[Throw-off]

Oh its ethyl acetate

 

[Dr. MMX]

I am really sorry but I just cant agree what your saying. Why acetone is that?
it depends what solvents your using and whats your synthesis procedure. Its not acetone that is a problem but a technique.

Sometimes when I did some mistakes during syntesis, I had these colors, but its just about bad reaction most liekly, or exceeding temp or doing something not smooth. Since some time I always get same result, I use acetone. Acetone has to be ice cold, added to cooled mixture, while stirring.

 

[DavidNichols]

Because of aldol condensation.