OC(CCCC)C(N)=O.[Na].[CH2:11]([CH:15]1[O:19][C:18](=[O:20])[NH:17][C:16]1=[O:21])[CH2:12][CH2:13][CH3:14].OC(CCCC)C(O)=O>>[CH2:11]([CH:15]1[O:19][C:18](=[O:20])[NH:17][C:16]1=[O:21])[CH2:12][CH2:13][CH3:14]A part of the reaction solution was sampled and the components of the reaction solution were analyzed by HPLC, as a result, the concentration of the starting material 2-hydroxyhexanoic acid amide was 1.6 mass % in the solution, the concentration of 5-butyl-oxazolidin-2,4-dione sodium salt as the objective product was 24.0 mass % in the solution and the concentration of 2-hydroxyhexanoic acid was 2.3 mass % in the solution. From these analysis values, the conversion of 2-hydroxyhexanoic acid amide was 92.6% and the yield in terms of 5-butyl-oxazolidin-2,4-dione was 82.1%.
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