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Author: Subject: Nitropropene ratios
conducter
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[*] posted on 19-3-2007 at 13:58
Nitropropene ratios


afoaf was talking to me about how he was following a synth on Rhodiums archive that goes as follows...

"One mole of benzaldehyde, one mole of nitroethane, 5 mL of n-butylamine and 100 mL of absolute ethanol (no water!) were refluxed for 8 hours in a 1000 mL round bottom flask. When the contents were cooled and stirred a heavy, yellow, crystalline mass formed immediately. After recrystallization from absolute ethanol, the 1-phenyl-2-nitropropene weighed 105 g. Yield: 64 %. M.P.: 65 °C"

Now he told me he had a mixture of 80% Nitroethane, and 20% methanol. He was wondering if one can just add more nitroethane to the mix, and add less ethanol (since the denatured alcohol will have a little methanol anways).

Or if the methanol will fuck up the reaction?
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Nicodem
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[*] posted on 19-3-2007 at 15:26


Your "afoaf" should really learn the basics of chemistry, like stoichiometry and stuff.
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Levi
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[*] posted on 20-3-2007 at 00:21


Quote:
Originally posted by Nicodem
Your "afoaf" should really learn the basics of chemistry, like stoichiometry and stuff.


Harsh but true.




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chemrox
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[*] posted on 23-3-2007 at 22:29
nitroethane containing automotive product


Wasn't there an earlier post here about a product that contained nitroethane and alcohol or nitroethane and acetone and that it was an automotive solvent?

Has anyone any better information? This could be useful. BTW why doesn't your friend distill the stuff he has and isolate the nitroalkane?
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nightflight
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[*] posted on 31-3-2007 at 15:12


Wouldn´t he then get an azeotrope or, at best, the NM %-age of the the fuel, plus a little more off residual oil?

A bit off-topic -what is the mechanism or function of the amine/ammonium in this reaction, especially the conjugate acid in the acetate version? -could pyridine be used as a base?

[Edited on 31-3-2007 by nightflight]

[Edited on 1-4-2007 by nightflight]
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