AlphaDecay
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Uses of Urea - Carbamide - CO(NH2)2
Does anyone know any use of urea in the field of synthesizing common lab chemicals/substances/reagents?
Urea is an easy obtainable chemical compound, but I can't find anything about its chemical reactions on the internet.
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Metacelsus
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You can try reacting it with propylene (or ethylene) glycol to form the cyclic carbonate. The reaction is tricky, however.
http://www.sciencemadness.org/talk/viewthread.php?tid=27478#...
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ParadoxChem126
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It can be used to convert benzoic acid into benzamide. Aniline can then be made from benzamide via the Hofmann rearrangement. Aniline is a very useful
starting point in organic syntheses.
http://www.sciencemadness.org/talk/viewthread.php?tid=4201&a...
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AlphaDecay
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I've been searching the net and I found that Nitroguanidine can be made this way: urea + ammonium nitrate fused together with silica gel as a
catalyst, which gives Guanidine Nitrate, that through dehydration with H2SO4 gives Nitroguanidine . Can I use ordinary sand or quartz powder instead
of silica gel, since all of them are Silicon Dioxide?
Post which shows this reaction:
http://www.sciencemadness.org/talk/viewthread.php?tid=14342#...
Sorry for any english misspell.
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gdflp
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Sand or quartz have impurities which make them less than ideal so I would try to get silica gel or sodium silicate(Which you can make in to silica
quite easily). Another reaction you can try is heating urea with potassium or sodium nitrate to yield the corresponding cyanate.
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Bert
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There is another nitroguanidine synthesis starting from urea and sulfamic acid, carried out at lower temperatures.
Via Axt: Nitroguanidine from sulfamic acid and urea
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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AlphaDecay
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What is the ratio urea-ammonium nitrate-catalyst(silica gel)?
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AlphaDecay
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http://www.google.com/patents/US4390726
I found this:
"EXAMPLE 2
Below another discontinuous process for the production of guanidine nitrate from urea and ammonium nitrate.
A melt consisting of
60.0 kgs of urea
120.0 kgs of ammonium nitrate temperature 120° C.
40.0 kgs of silicagel
is passed into the stirred reactors.
The mixture is heated."
Could the ratio be 3-6-2 by weight?
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