organic chemistry

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uzer
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#1
Report Thread starter 7 years ago
#1
in a few organic reactions the products containes one more carbon atom than the starting material

write the equation for a reaction in which the organic compound bromoethane whicn contains 2 carbon atoms is converted into an organic compound which contains 3 carbon atoms

state conditions for this reaction
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username1256732
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#2
Report 7 years ago
#2
It is reacted with a nitrile, e.g KCN and the extra C comes from the nitrile. the reaction is nucleophillic substitution hopefully this helps a little
The conditions will be on your toolkit, I can't remember them right now, I'm sure some ethanol (aq) comes into it, but don't quote me on that :/
It may just be KCN and reflux actually. But you'll have to check that
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uzer
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#3
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#3
hi can you please explain this

ethanol may be converted into propanoic acid in a three stage process which uses ethanol as the only organic compound

C2H5OH (step 1 ) ----> K (step 2) ----> L (step 3) ----> C2H5CO2H

thanks for the help
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username1256732
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#4
Report 7 years ago
#4
(Original post by uzer)
hi can you please explain this

ethanol may be converted into propanoic acid in a three stage process which uses ethanol as the only organic compound

C2H5OH (step 1 ) ----> K (step 2) ----> L (step 3) ----> C2H5CO2H

thanks for the help
Okay, so in step 1, we want to convert ethanol into bromoethane by refluxing with HBr (aq). This is step one and K is bromoethane.

Next, we need to add an extra C. This is done by nuclephillic substitution with a nitrile group. So we react bromoethane with KCN and ethanol (aq) and reflux it. This gives L as:

CH3CH2CN.

Now we have our extra carbon and all we need to do is hydrolyse the CN bond to form a carboxylic acid.

And so step 3 is reacting our propanenitrile with concentrated sulfuric acid, water and then reflux.

This gives the required propanoic acid.

Hope this helps you
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uzer
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#5
Report Thread starter 7 years ago
#5
(Original post by mathematigeek)
Okay, so in step 1, we want to convert ethanol into bromoethane by refluxing with HBr (aq). This is step one and K is bromoethane.

Next, we need to add an extra C. This is done by nuclephillic substitution with a nitrile group. So we react bromoethane with KCN and ethanol (aq) and reflux it. This gives L as:

CH3CH2CN.

Now we have our extra carbon and all we need to do is hydrolyse the CN bond to form a carboxylic acid.

And so step 3 is reacting our propanenitrile with concentrated sulfuric acid, water and then reflux.

This gives the required propanoic acid.

Hope this helps you
so does n react with sulphuric acid to form nitrogen sulphate
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username1256732
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#6
Report 7 years ago
#6
(Original post by uzer)
so does n react with sulphuric acid to form nitrogen sulphate
Not too sure if I'm honest :/ I'm really sorry
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uzer
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#7
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#7
(Original post by mathematigeek)
Not too sure if I'm honest :/ I'm really sorry
but there wouldnt be a nitrogen in the final product right?
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username1256732
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#8
Report 7 years ago
#8
(Original post by uzer)
but there wouldnt be a nitrogen in the final product right?
Not in the carboxylic acid, but yes, there will be a product that contains nitrogen as a part of the reaction. I'm just unsure of what it would be
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uzer
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#9
Report Thread starter 7 years ago
#9
ok thanks for the help
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