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How to remove Acetic Anhydride?

I am trying to form 2,2-diacetoxy acid using acetic anhydride and glyoxylic acid monohydrate (Scheme below) I could not find a suitable synthetic protocol for this, so I just added 10 equivalents of acetic anhydride to 1 equiv. of glyoxylic acid monohydrate and refluxed the mixture at 140 °C. Now the limiting agent (glyoxylic acid […]