Originally Posted by anoymous
that's a weird one indeed
you cleaned every bit of glasswork?
what did you use as purification?
what did you use as solvent (during the reaction, not for the nmr)?
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We did our best cleaning the glass work. The solvent was the acetic anhydride and for purification we redissolved the product in heated ethanol and water and set the solution aside for re-cristalization.
We are thinking this strange signal is actually the proton on the carboxylic acid which moved downscale because of the specific environment.
The NMR solvent was CDCl3.