TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The base is sodium hydroxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method further comprises: (c) adding an acid into the reaction solution, (d) adjusting pH of the reaction solution with a base and (e) cooling the pH-adjusted reaction solution to obtain crystals; and distilling the pH-adjusted reaction solution between the step (d) and the step (e). The step (b) is carried out by adding sodium hydrosulfite to the solution, and then heating the solution to 40-80 degrees C. The pH is adjusted to 9-10. The pH-adjusted reaction solution is cooled to -5 degrees C to 10 degrees C and distilled under reduced pressure of 30-50 millimeter of mercury (mmHg). Preferred Components: The solvent is water, aliphatic alcohol, tetrahydrofuran, acetone, acetonitrile, dioxane, dimethyl sulfoxide, acetic acid, dimethylformamide, N- methylpyrrolidone or dimethylacetamide. The aliphatic alcohol is methanol or ethanol. The acid is hydrochloric acid. EXAMPLE - A solution of 10 g of 4-(4-nitrophenyl)-3-morpholinone in 75 ml of purified water was stirred at 23 degrees C for 30 minutes. 25.85 g of Sodium hydrosulfite was added to the solution, heated to 50 degrees C and then stirred for 2.5 hours. After completion of the reaction, the reaction mixture was heated to 70 degrees C and dropwise added with 45.5 ml of aqueous hydrochloric acid solution for 3 hours. The reaction mixture was cooled to 23 degrees C and adjusted to a pH of 9-10 by dropwise adding 30 wt.% of aqueous sodium hydroxide solution. The resulting solution was distilled under a reduced pressure of 40 mmHg to a volume of 80 ml. The remaining solution was subjected to crystallization while stirring for 4 hours at 3-5 degrees C to obtain crystals. The crystals were filtered and then washed with 30 ml of purified water at 5 degrees C. The resulting crystals were dried in vacuum at 40 degrees C for 6 hours to give 8.04 g of 4-(4-aminophenyl)-3-morpholinone as a white solid.