[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[C:17]2[C:12](=[C:13]([CH3:19])[CH:14]=[C:15]([CH3:18])[CH:16]=2)[N:11]=[CH:10][C:9]=1[C:20]([O:22]C)=[O:21].[OH-].[K+].C(O)C.Cl>O>[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[C:17]2[C:12](=[C:13]([CH3:19])[CH:14]=[C:15]([CH3:18])[CH:16]=2)[N:11]=[CH:10][C:9]=1[C:20]([OH:22])=[O:21]A mixture of methyl 4-(2-chlorophenyl)-6,8-dimehtyl-3-quinolinecarboxylate (0.98 g), potassium hydroxide (0.5 g) and 80% ethanol (10 ml) was refluxed for 15 mins. The mixture was diluted with water and acidified with hydrochloric acid to give 4-(2-chlorophenyl)-6,8-dimethyl-3-quinolinecarboxylic acid as crystals (0.90 g, 96.8%), which was recrystallized from ethanol as colorless prisms. m.p. 234°-235° C.
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