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Author: Subject: Possible OTC, 'safe' methylating agents
itsafineday
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[*] posted on 14-2-2019 at 15:23


Doh! I am such and eeeeediot :) and good at wasting money in this hobby.
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TGSpecialist1
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[*] posted on 17-2-2019 at 21:55


I wonder if it would be possible to make dimethyl carbonate by dissolving magnesium in methanol, bubbling dry CO2 through it to make magnesium methyl carbonate, distilling to dryness, then cracking it with heat to dimethyl carbonate and magnesium carbonate.
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clearly_not_atara
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[*] posted on 21-2-2019 at 16:43


You know, I keep trying to think of a problem with that and I can't. It does seem like it would work better if you could obtain metallic calcium, just based on analogy to similar reactions, but Mg should be fine I guess.



[Edited on 04-20-1969 by clearly_not_atara]
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Chemi Pharma
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[*] posted on 26-2-2019 at 11:13


I have a patent teaching how to produce (DMC) Dimeyhyl Carbonate without the use of Phosgen. They use just Dimethyl oxalate (easy to produce. See here at Doug's Lab You Tube vídeo: https://www.youtube.com/watch?v=imtSH3OAdKE) and Sodium Methoxide at 100ºC.

The Patent is attached:

Attachment: Dimethyl carbonate from dimethyl oxalate and sodium methoxide.pdf (269kB)
This file has been downloaded 25 times
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starlight_
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[*] posted on 27-2-2019 at 12:08


That’s a very interesting post by Chemi Pharma on preparation of dimethyl carbonate.

Is an autoclave necessary to do this do you think, or could the DMC be distilled off as it is formed by heating up reactants in standard rbf? (Obviously CO would have to be vented or scrubbed).
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Chemi Pharma
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[*] posted on 27-2-2019 at 20:12


The Patent say that the temperature of the batch needs to stay between 50-150ºC. cause this I think an autoclave use is not mandatory. I'd rather heat the batch with a water bath (90-100ºC) at reflux. DMC has a boiling point of 90ºC, then it could be refluxed during the 1,25 hours needed, while CO escapes on the top of the column.
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