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Metacelsus
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Salts, for example. Also oligomerized oxidation products (similar to aniline).
I agree that it probably isn't worth trying to purify the brown powder to get rid of the color. It could be 99.9% pure and still be brown. The brown
stuff is probably good enough for most purposes.
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Pumukli
National Hazard
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Thanks Amos, good to know that "cocoa powder" from this reaction is still as good as the original thing! ![:)](./images/smilies/smile.gif)
If you have some pure anthranilic acid - and some time - then you may conduct a precipitation experiment with it. I'd like to hear about the results
of this. ![:)](./images/smilies/smile.gif)
Basically, dissolve some AA in dilute acetic acid and mix this solution with the solution of some water soluble Ca2+-salt. (Chloride,
acetate, what you have at hand). Then wait and report what happens! I think you will got precipitation after a few hours (days), and that precipitate
won't melt below 300 C.
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Pumukli
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I slowly explore parts of this particular Hofmann rearrangement and I found it more and more interesting from an amateur's point of view.
A seemingly simple reaction but there are several stages and hidden steps involved and it is a challenge to try to trace them.
My biggest achievement is that I think I solved the "black tar" problem and now I know how to avoid it altogether!
I also prepared a few hundred milligrams pretty good AA at last (mp: 146-147 C). Yield is not great yet but hopefully I could improve it too.
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