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- Dec 21, 2022
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Hi guys, I'm really struggling to form the tartrate from the freebase.
This was my third trial, the first two were kinda messy and solvent probably not anhydrous, the amount of tartaric was also eyeballed to prevent losses from transferring the freebase flakes in a container to be weighted. I think the formation of hemi and ditartrate could have inhibited each other crystallization, so for my last try, stechiometric amounts were used.
I started with 1060mg of cream colored freebase which was dissolved in 4ml of anhydrous warm methanol, 245mg of tartaric acid were added and dissolved in a few seconds. Solution was stirred for a few minutes then ether was added dropwise ensuring the precipitate caused by a drop dissolved before another one was added.
Very slowly the solution got cloudy, a few more drops were added and solution was kept stirring for a few minutes.
After 10 minutes I checked on the process and sadly as happened on the other past failed runs an oily residue
precipitated with no crystal whatsoever. If anyone has any advice it would be immensely appreciated.
Attached below the photo of the freebase.
This was my third trial, the first two were kinda messy and solvent probably not anhydrous, the amount of tartaric was also eyeballed to prevent losses from transferring the freebase flakes in a container to be weighted. I think the formation of hemi and ditartrate could have inhibited each other crystallization, so for my last try, stechiometric amounts were used.
I started with 1060mg of cream colored freebase which was dissolved in 4ml of anhydrous warm methanol, 245mg of tartaric acid were added and dissolved in a few seconds. Solution was stirred for a few minutes then ether was added dropwise ensuring the precipitate caused by a drop dissolved before another one was added.
Very slowly the solution got cloudy, a few more drops were added and solution was kept stirring for a few minutes.
After 10 minutes I checked on the process and sadly as happened on the other past failed runs an oily residue
precipitated with no crystal whatsoever. If anyone has any advice it would be immensely appreciated.
Attached below the photo of the freebase.