shanmugapriya
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sodiumdithionate
Can anyone of you tell me procedure for reduction of nitro to amine by sodiumdithionate. plz
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woelen
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Dithionate, S2O6(2-), is not a reductor, it is nearly as inert as sulfate. Only strong oxidizers are capable of oxidizing the dithionate ion to
sulfate ion.
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AndersHoveland
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I would be curious if you know any reactions that can be done with dithionate.
Perhaps with acetone? (reaction might be slow)
Elemental iodine spontaneously reacts with acetone. And sulfur will oxidize anhydrous hydrogen iodide.
[-]O-SO2-S-CH2-CO-CH3
[Edited on 12-9-2013 by AndersHoveland]
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woelen
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I once purchased 100 grams of potassium dithionate, but I have to conclude that this chemical is not very interesting. It does react with anything, I
have not found any interesting redox chemistry, nor any formation of precipitates or complexes. It is remarkably inert.
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Dr.Bob
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It is used to reduce aromatic nitro compounds to anilines in some cases. But it requires heat, time and the right solvent. There are some cases in
which that works without affecting double bonds, benzyl esters and other easily reduced functional groups. It is also used in the synthesis of
luminol from 3-nitrophthalic hydrazide in one of the older Fieser organic texts. But it does go bad over time, I believe, due to air oxidation.
If you want procedures, just Google "sodium dithionite reduction of nitro compounds"or look in SciFinder.
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Nicodem
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I think I would have read about it, if sodium dithionate would be able to reduce anything organic. Do you have any reference at all?
| Quote: | | It is also used in the synthesis of luminol from 3-nitrophthalic hydrazide in one of the older Fieser organic texts. |
No. Sodium dithionite is used in that synthesis.
| Quote: | | If you want procedures, just Google "sodium dithionite reduction of nitro compounds"or look in SciFinder. |
That wont help much as the question is about procedures using sodium dithionate. If the original poster was interested in the dithionite, he would not
be asking for examples here. Already a google search gives tons of examples.
…there is a human touch of the cultist “believer” in every theorist that he must struggle against as being
unworthy of the scientist. Some of the greatest men of science have publicly repudiated a theory which earlier they hotly defended. In this lies their
scientific temper, not in the scientific defense of the theory. - Weston La Barre (Ghost Dance, 1972)
Read the The ScienceMadness Guidelines!
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woelen
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Maybe the OP made a typo or does not know the difference between dithionite and dithionate. Dithionite is the ion S2O4(2-), which is a strong and fast
acting reductor, which is very unstable in acidic solutions (gives rise to very nasty and smelly sulfurous compounds). Dithionate is the ion S2O6(2-)
and this is a rather tame and inert ion, both at high pH and at low pH. I have not found any interesting reactions with this ion and the stuff now is
sitting on the shelve, waiting for a nice application or demonstration. Even a strong oxidizer like KMnO4 has difficulty oxidizing dithionate, it
requires heating and the reaction is slow.
If you use dithionite, then be careful. The sodium salt of this is quite dangerous. It gives off very pungent fumes and especially if it is damp it
may become pyrophoric and inflame spontaneously when brought in contact with air! I have some of this salt and it must be stored in a very tightly
stoppered bottle!
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shanmugapriya
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Thank you for the kind replies. sodiumdithionate is not workable one. Can i make use of sodiumdithionite for reduction of nitro group. My friend
suggest me to use sodiumdithionite with sodiumbicarbonate in THF/Water system. I have done but no reaction carried out. Kindly propose the method to
improve the reduction.
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bfesser
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Thread Moved
12-9-2013 at 16:54 |
woelen
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Please tell the precise compound to be reduced. Not all nitro-compounds can be treated in the same way, more background information is needed for a
useful and detailed answer.
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Dr.Bob
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Sorry, I missed the spelling being dithionate. I have never even heard of that ion (S2O6)-2, and given the spelling on here, I would have chalked
it to being a typo if I had noticed it. That would be a very weak reducing agent indeed. I was referring to dithionite, which works great for some
reductions. Sorry again for replying when tired, I did not catch the spelling.
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