Chemical Forums
Specialty Chemistry Forums => Citizen Chemist => Topic started by: limpet chicken on November 28, 2004, 06:00:23 PM
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What options for the synthesis of aldehydes are available, I have been looking into it of late, and was curious about the synthesis of benzaldehyde of which there are a good few, and of acetaldehyde, for making acetic anhydride.
Are there any ways to add the -CHO group directly onto benzene to produce benzaldehyde? benzaldehyde is watched or controlled for some reason or other pertaining to clandestine synthesis I believe, although what I can't remember, but benzene is quite easily available, I am looking for possible routs from alkenes to the aldehydes, and indeed, aldehyde preperation in general. Preferably those that stand some chance of success in a "ghetto" setup, I.E those not requiring catalytic hydrogenation and such tedious things.
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Every Friday and Saturday night I tend to produce mass quantities of acetaldehyde from ethanol. It happens right here in me liver. ;D Sadly, it gets metabolized immediately into acetic acid. I'm guessing you could probably reflux concentrated ethanol with concentrated sulfuric acid which may remove a water molecule, thus giving you acetaldehyde. (Though that's just a guess and I'm not sure if that would work).
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Out of curiosity, how is acetaldehyde used to make acetic anhydride? It's in the wrong oxidation state.
There are lots of ways to formylate aromatic systems. Two of the favorites: Gatterman-Koch, Villsmaier-Haack.
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Jdurg, refluxing concentrated H2SO4 will join two molecules of ethanol together by forming a bond between the ethanol and an oxygen molecule, giving diethyl ether.
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Jdurg, refluxing concentrated H2SO4 will join two molecules of ethanol together by forming a bond between the ethanol and an oxygen molecule, giving diethyl ether.
Hmm... I wonder if glacial acetic acid could be dehydrated by concentrated sulfuric acid in a reflux, or if acetone could be "cracked" using sulfuric acid?