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http://en.wikipedia.org/wiki/Propionic_anhydride
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ps.when making the propionic anhydride-two things
>approx how long do you have to heat the sodium hydrogen sulphate-
>why a charcoal fire? is another heat source ok or is something special bout this?
>could you explain this process a little more specifically (and if i'm successful you've got an online mate for life!!!)