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Dany
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Registered: 3-8-2013
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Hello Papaya,
Aryl boronic acid can be used with alkylnitrite for aromatic nitration of electron rich substrate. Electron poor substrates need the addition of Boric
acid to accomplish the nitration
see Sheme 18 of the following paper on aromatic nitration:
Attachment: Recent advances in the synthesis of aromatic nitro compounds.pdf (734kB)
This file has been downloaded 924 times
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Fantasma4500
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Quote: Originally posted by caterpillar  | | You, boys, are wrong about Ca(NO3)2. It has its own advantages. I tried all of aforementioned salts. I used KNO3 for TNP preparation and I think that
it is the best choice for this particular compound. I got a runaway reaction, when I tired to use NH4NO3 instead. It was a mild reaction, but I got a
foam with red bubbles and had to stop process. Ca(NO3)2 is the best choice for NC or NG. There are some simple tricks with it. You have to delete all
water from it and then smash this mass to small pieces, but not to dust. 1-3 mm in size. Then put it into H2SO4- I used 92-94 % acid. Wait for a day
and night. some times you have to turn a bottle with mixture bottom up- pieces of Ca(NO3)2 must go down through acid. Then you may decant the upper
layer. Yeah, you'll loose some mixed acid with CaSO4, because it forms very small crystals. But most likely it extracts some water from acid and
therefore increases concentration of resulting mixed acid. |
would this mean, that you would be able to make pretty well 99% HNO3 somewhat, without any CaSO4 being suspensed in the solution?? thats very
interesting, i didnt consider that the H2SO4 / Ca(NO3)2 mix would create runoff when i filtered it through paper. anyhow i still stick to the idea
that it will fully work if using a nice big sheet of NC for filtering it with (bought NC perhaps, or extracted from fireworks?)
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caterpillar
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The upper layer was transparent, therefore there was no CaSO4, floating in. You may use glass material or asbestos for filtering after decantation of
the upper layer. I do not think, that in that way one may get pure HNO3- same problem with floating CaSO4. I made usual mix- 60% H2SO4 and 40% HNO3.
Therefore, initially I had large enough amount of liquid and pieces of Ca(NO3)2 was completely covered with sulfur acid. If one take smaller amount
of H2SO4, wanting to get only HNO3 plus gypsum, he surely will get mess of liquid and small crystals and no upper layer to decant it. But may be even
in such case liquid could be extracted, using vacuum filtering. I never tried- do it for yourself.
Women are more perilous sometimes, than any hi explosive.
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