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26 Jan 2009 10:05:22 IST

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how to convert acetaldehyde toluene

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how to convert acetaldehyde toluene

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rtrikha

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26 Jan 2009 11:40:32 IST

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Acetaldehyde can be converted into acetylene in the following steps

CH₃CHO --------------- reduction(LiAlH₄)-------> CH₃CH₂OH ------HBr------> CH₃CH₂Br------ KOH(alc.) ------> CH₂=CH₂_---------Br₂_-------->CH₂(Br)-CH₂(Br)----------------------- 2KOH(Alc)-----------> Acetylene + 2KBr + 2H₂O

Then Acetylene in converted into Benzene then to Toluene in the following way

Madmax

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26 Jan 2009 12:00:02 IST

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sir, is this step: CH3CH2Br------ KOH(alc.) ------> CH2=CH2

favourable?? coz as far as I know, this alkene formation is not kinetically favourable...... so higher temp will have to be used to ensure tht this product is formed

right??

rtrikha

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26 Jan 2009 12:06:11 IST

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Alkyl halide is converted to alkene via alcoholic KOH and we always use this method for conversion .Of course the reaction is completed on heating only . this is basic dedydrohalogenation reaction.

saharsha kumar keshkar

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26 Jan 2009 12:07:29 IST

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Acetaldehyde can be converted into acetylene in the following steps:

CH₃CHO --------------- reduction(LiAlH₄)-------> CH₃CH₂OH ------HBr------> CH₃CH₂Br------ KOH(alc.) ------> CH₂=CH₂_---------Br₂_-------->CH₂(Br)-CH₂(Br)----------------------- 2KOH(Alc)-----------> Acetylene + 2KBr + 2H₂O

hope u UNDERSTAND!

RATE AND NUDGE ME!

rtrikha

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26 Jan 2009 12:23:52 IST

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@saharsha kumar keshkar pls give your own answer to get rate don t copy and copy and paste answers already on the board

rafa in revival mode

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26 Jan 2009 12:41:44 IST

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saharsha there is a prob in your answer bcoz you rather use alc koh for dehydrohalogenation for ist step and nanh2 for next step not alc koh for both the steps.

A$PIRing HiGh - dEv aDitYa

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26 Jan 2009 12:52:09 IST

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I think for better yield, NaNH2 can be used than alc.KOH

rafa in revival mode

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26 Jan 2009 13:07:33 IST

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see nanh2 is a better base than alc koh so its advised to use nanh2 .this ques is asked in iit 2007chem part 1

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