Sulfuric Acid → HCID 70457844, 화합물

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A 11.7 g portion of DL-valine, 13.4 g of N-carbobenzoxy-L-aspartic acid and 2.5 g of sulfuric acid were added to 50 ml of water and the resulting solution was heated to 50° C. This solution was cooled to 20° C. at a rate of 2° C. per hour while stirring, and was stirred for another two hours. The resulting crystal was separated, washed with 20 ml of water and dried to give 9.7 g of an L-valine/N-carbobenzoxy-L-aspartic acid salt. Analysis showed that the optical purity of the L-valine was 98%.

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