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Author: Subject: SO3 complex in an aprotic solvent

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[*] posted on 14-2-2006 at 16:56
SO3 complex in an aprotic solvent

I saw a method for making a complex of SO3 in DMF. The main idea of this method was : to put oleum vapours in contact with DMF cooled in an ice bath with continuous stirring. It takes a while to get this complex at a decent concentration and it's a big waste of oleum. So my question is, is there any reason why they don't do simply this reaction with DMF+ Na2SO3???

p.s they wanna keep the DMF anhydre and they wanna make this SO3 reacts with an ester group to form R-COOSO3 Sorry for my bad english
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[*] posted on 15-2-2006 at 13:16

Na2SO3 is very different from SO3. SO3 is the anhydride of sulfuric acid, while Na2SO3 is the sodium salt of sulfurous acid. You cannot substitute Na2SO3 and get the same results.

[Edited on 2-15-2006 by Polverone]

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