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Author: Subject: isopropylamine + kmno4 then H2SO4
acx01b
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[*] posted on 1-12-2005 at 04:57
isopropylamine + kmno4 then H2SO4


first dissolved 0.05g Kmno4 in 10ml water (purple color), then added 0.5ml (excess) isopropylamine, color became blue-green (nearly same color as kmno4 + Naoh, but more blue, less green) then solution became quite clear.... and finally added 8ml 35% H2SO4 (excess) and solution became 100% orange....

but no Mn compounds precipitated...

so what happened ? is it Mn2+ compound that give orange color ? ty for help

can isopropylamine be oxided by kmno4 ???
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chemoleo
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[*] posted on 1-12-2005 at 09:25


Were you trying to make 2-nitropropane?

In that case, I'd also check the nitroalkane, and nitroethanol threads, there's some info on KMnO4 oxidation. I don't think it's a well-studied method.

Anyway.... I should think the orange colour is a result of polymerisation products of isopropylamine, and oxidised/condensed variations, similar to acetone acquiring a dark colour in the presence of H2SO4.

No, Mn2+ is weakly pink, not orange.

Your excess vs KMnO4 are quite big, why?




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acx01b
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[*] posted on 1-12-2005 at 09:28


was just trying to see if isopropylamine could make kmno4 reacting

ok ty

i got complete decoloration of kmno4 solution by mixing with excess H2SO4 and isopropylamine, that would mean isopropylamine is oxyded, but in what ???
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Nicodem
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[*] posted on 1-12-2005 at 10:21


to acetone of course



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