Organic Chemistry

Niladri Chakraborty's Avatar
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11 Mar 2012 21:20:57 IST
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An awesome conversion..
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 convert acetylene to melletic acid in not more than three steps.



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ronnie's Avatar

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11 Mar 2012 22:59:24 IST
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EASY...ethyne>>(red hot cu tube,high temp)>>benzene>>exhaustive alkylation(or 6 moles of ch3cl an an.alcl3)and oxidation by alk.kmno4

Niladri Chakraborty's Avatar

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12 Mar 2012 10:33:02 IST
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actually, it's not that easy.. if you do that exhaustive alkylation, the yield of melletic acid will be only about 4-5 percent.. you will get a mixture of aromatic acids.. the no. of carboxylic acid groups varying from 1 to 5 -COOH groups.. so your, cannot separate the required product.
Niladri Chakraborty's Avatar

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12 Mar 2012 10:35:01 IST
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find a suitable way to get hexamethyl benzene from ethyne first..
ronnie's Avatar

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12 Mar 2012 11:48:41 IST
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you hav a pt.i didnt take acount of yield.so another method could be somewaht....

>>2 butyne{1)2moles NANH2,liq NH3,2)2 moles CH3Br}

then the cyclisation process and then oxidation......and u have it in a better yield....

Niladri Chakraborty's Avatar

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12 Mar 2012 18:12:54 IST
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right bro!
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12 Mar 2012 18:21:36 IST
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Please could you explain your answer elaborately so that i can gain some knowledge ... in conversion
Madhusudan Chavan's Avatar

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12 Mar 2012 21:48:08 IST
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 Convert acetylene to dimethyl acetylene via disodium acetylene followed by reaction with methyl bromide.

Trimerization of dimethyl acetylene in presence of triethylchromium catalyst gives hexamethyl benzene.

Oxidation of hexamethyl benzene with alkaline KMnO4 gives the required compound.




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