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Author: Subject: Acetic anhydride preparation
Keras
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[*] posted on 27-5-2024 at 00:10


Quote: Originally posted by greenlight  

The only problem is the maximum temperature that can be achieved is low due to DCM's boiling point ~38°C.

Hexane won’t mix with acetic acid, which is polar.
That’s why I’ll try DMSO. It’s polar, aprotic and has a boiling point well above that of Ac₂O.
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[*] posted on 27-5-2024 at 08:51


@paulll, yes, stoichiometrically the yields from phosphorus pentoxide reagent are terrible haha. I only need just over a 100 ml but even that's probably pushing it.

@keras, are you sure glacial acetic acid isn't soluble in hexane? The SM wiki says it is and I'm sure I looked through a paper that said glacial acetic acid is soluble all the way up to around octane the other day.




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[*] posted on 27-5-2024 at 11:05


Quote: Originally posted by greenlight  

@keras, are you sure glacial acetic acid isn't soluble in hexane? The SM wiki says it is and I'm sure I looked through a paper that said glacial acetic acid is soluble all the way up to around octane the other day.

Well, best way is try it. :) But I would be surprised!
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