One thing a buddy had reported is that the FASA method results in a product highly contaminated with fumaric acid. This was confirmed by TLC and other tests. Fumaric acid is only very weakly soluble in water whereas the DMT fumerate is soluble enough. Thus rather than doing several acetone washes at the end one can just extract the white crystals with a small amount of water to remove the desired compound and leave behind the unionized fumaric acid. Carefully decant the liquid off and then just evaporate the water to get the product. Maybe do one more water wash just to be safe.
Of course this takes longer to evaporate the water however the product will have minimal fumaric acid whereas even with severeal acetone washes a large fraction of the product can be fumaric acid crystals. Also one does not have to use very much water as DMT fumerate is water soluble I do not know the exact amount however. i have heard that 69ron (although i did not read this myself) said it is not very soluble however I disagree I do not know the exact amount but pure DMT fumarate does dissolve in water. DMT fumarate is commonly used for IV injections in the scientific literature. SWIMs experience would confirm this high soluability. I was unable to find any info on DMT fumarate solubility if anyone knows it that would be great. It could be used to figure out the exact amount of water needed. But do not calculate the solubility on your own from your FASA because it will be impure and contaminated with undissolved fumaric acid!!! Anyone who would do this would think it was very weakly water soluble.
One could also add a base and extract the freebase with an organic solvent.
Of course this takes longer to evaporate the water however the product will have minimal fumaric acid whereas even with severeal acetone washes a large fraction of the product can be fumaric acid crystals. Also one does not have to use very much water as DMT fumerate is water soluble I do not know the exact amount however. i have heard that 69ron (although i did not read this myself) said it is not very soluble however I disagree I do not know the exact amount but pure DMT fumarate does dissolve in water. DMT fumarate is commonly used for IV injections in the scientific literature. SWIMs experience would confirm this high soluability. I was unable to find any info on DMT fumarate solubility if anyone knows it that would be great. It could be used to figure out the exact amount of water needed. But do not calculate the solubility on your own from your FASA because it will be impure and contaminated with undissolved fumaric acid!!! Anyone who would do this would think it was very weakly water soluble.
One could also add a base and extract the freebase with an organic solvent.