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keren4god
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PostPosted: Wed Feb 16, 2011 5:05 pm    Post subject: I dont know the products to KMnO4 + C5H8O2 Reply with quoteFind all posts by keren4god

KMnO4 + C5H8O2 = Mn(acac)3 + ??

water was added too
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PostPosted: Thu Feb 17, 2011 3:43 pm    Post subject: Reply with quoteFind all posts by expert

The result depends on what C5H8O2 compund is. There are many possible isomers:
valerolactone? Ethylacrylate?
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keren4god
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PostPosted: Thu Feb 17, 2011 5:28 pm    Post subject: Reply with quoteFind all posts by keren4god

Its acetylacetone (acac)
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PostPosted: Thu Feb 17, 2011 11:20 pm    Post subject: Reply with quoteFind all posts by expert

In acetylacetone complex Mn is 3+ while permanganate has Mn(7+). If this reaction takes place, acetylacetone (or 2,4-pentanedione) must oxidize and then excess of acetylacetone should react with Mn(3+) product of reduction.

To know exactly what is going on you have to read the papers on that subject:
http://onlinelibrary.wiley.com/doi/10.1002/kin.20177/abstract
http://course1.winona.edu/cmiertschin/450/Lab/Acac_lab.pdf

As you can see from the second report, they use Mn(2+) compound as a reducing agent. Without that compound acetylacetone can be a reducing agent and the product of oxidation most likely will be potassium acetate and pyruvate:

CH3COCH2COCH3 <===> CH3COCH=C(OH)CH3 --(KMnO4)--> CH3COCOOK + CH3COOK
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keren4god
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PostPosted: Fri Feb 18, 2011 8:46 am    Post subject: Reply with quoteFind all posts by keren4god

Thanks that helps Smile
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