[Cl:1][C:2]1[CH:3]=[C:4]([C:8](=O)[CH2:9][OH:10])[CH:5]=[CH:6][CH:7]=1.[C-]#[N:13].[K+].C[CH:16]([OH:18])C.C(O)(=O)C>O>[Cl:1][C:2]1[CH:3]=[C:4]([C:8]2[NH:13][C:16](=[O:18])[O:10][CH:9]=2)[CH:5]=[CH:6][CH:7]=1To a mixed solution of 1-(3-chlorophenyl)-2-hydroxyethanone (21.8 g), potassium cyanide (20.8 g) and 2-propanol (100 mL) was added acetic acid (18 mL) at room temperature. After stirring for 30 min, water was added, and the precipitated crystals were collected by filtration and recrystallized from methanol-diisopropyl ether to give 4-(3-chlorophenyl)oxazol-2(3H)-one (6.7 g, yield 41%) as a solid.
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