GLUTAMIC ACID BENZYL ESTER N-CARBOXYLIC ANHYDRIDE
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United States of America Patent
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Issued Date -
Dec 5, 2013
app pub date -
Mar 19, 2012
filing date -
Mar 25, 2011
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Abandoned
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Abstract
An object of the present invention is to provide crystal polymorphs which have a high bulk density and are excellent in storage stability, among crystal polymorphs of a glutamic acid benzyl ester N-carboxylic anhydride. According to the present invention, the crystal polymorphs of glutamic acid benzyl ester N-carboxylic anhydride that have a bulk density of 0.45 g/cm3 or higher can be obtained by dissolving glutamic acid benzyl ester N-carboxylic anhydride in a solvent which has been heated at a temperature equal to or higher than 40° C. and lower than a boiling point thereof and is in an amount of 0.5 L or more per mol of the glutamic acid benzyl ester N-carboxylic anhydride, adding a poor solvent which is in an amount of 1.4 L or more per mol of the glutamic acid benzyl ester N-carboxylic anhydride at a temperature equal to or higher than 40° C. and lower than a boiling point thereof, precipitating crystals at a temperature equal to or higher than 40° C. and lower than a boiling point thereof, and cooling the crystals.
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