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Dry  hydrogen  chloride  gas  was  bubbled  through  ice-cold  acetyl  chloride  (400  cm  3)  for  5min.,  with  stirring. Methyl-2-(R)-amino-3-hydroxypropionate  hydrochloride (50  g,  0.32  mol)  was then  dissolved in  the  liquid and the  passage  of gas  curtailed.
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