O=[CH:2][C:3](=[CH2:5])[CH3:4].[Cl:6][C:7]1[CH:8]=[C:9]([NH2:17])[C:10](=[C:14]([Cl:16])[CH:15]=1)[C:11]([OH:13])=[O:12].[N+](C1C=C(S([O-])(=O)=O)C=CC=1)([O-])=O.[Na+].S(=O)(=O)(O)O>O>[Cl:6][C:7]1[CH:15]=[C:14]([Cl:16])[C:10]([C:11]([OH:13])=[O:12])=[C:9]2[C:8]=1[CH:2]=[C:3]([CH3:5])[CH:4]=[N:17]214 g of methacrolein were added dropwise, at l00? C, to a solution of 20.6 g os 4,6-dichloroanthranilic acid and 19 g of sodium m-nitrobenzenesulfonate in 200 g of 57% strength sulfuric acid. The mixture was stirred for 1 hour at 130° C., after which it was diluted with 450 g of water and filtered under suction while hot. The pH was brought to 2-3 with concentrated sodium hydroxide solution, while cooling with ice. The precipitated solid was filtered off under suction, washed with water and dried.
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