SupaVillain
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Ethylenediamine from ethylenediamine dihydrochloride
Can somebody inform me of a way to make ethylenediamine from ethylenediamine dihydrochloride? The dihydrochloride is way cheaper and I would think
safer to handle. I would rather store it this way and prepare ethylenediamine when it is needed. Ill be using it for polyureas unless another diamine
seems better.
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Chemosynthesis
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1. Sodium hydroxide. Extract with solvent of choice solubility.
2. Maybe carbonate (didn't check pKa).
3. A zoetrope distillation.
More info: https://www.sciencemadness.org/whisper/viewthread.php?tid=26...
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SupaVillain
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Thanks! I didnt find this in the search engine...
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Chemosynthesis
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No problem. It is an awkward beast.
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Dr.Bob
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In many cases you can simply use the salt in place of the free base, and then simply add more of whatever base you are using in the reaction already.
For instance, I just used a piperidine HCl salt in a reaction, and simply added one more equivalent of triethylamine to it than planned.
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AvBaeyer
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Take Dr Bob's advice. Ethylenediamine is a royal pain to purify. Once it has seen water it is almost impossible to get it anhydrous. Even drying over
solid KOH is not fully effective. Attached are two papers which give purification methods.
AvB
Attachment: Anhydrous ethylenediamine.doc (166kB)
This file has been downloaded 361 times
Attachment: Ethylene diamine purification IUPAC document.pdf (378kB)
This file has been downloaded 375 times
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