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400 G of ice-water and 120 G (0.65 mol) of cyanuric chloride dissolved in 753 g of methyl ethyl ketone are introduced into a 2.5 litre flat-flanged flask equipped with a condenser, stirrer and pH meter. Then, in the course of 65 min, 977 ML of a 12 % solution of 4,4'- diaminostilbene-2, 2'-disulfonic acid in soda water are slowly added dropwise at pH 4.5-5. 0 so that no excess of disulfonic acid is formed. When the addition is complete, stirring is carried out at an intemal temperature OF 5-10C for a further 10 min. Then, in the course of 15 min, 97.6 G (0.65 mol) OF 4-AMINO-N-METHYLBENZAMIDE ARE intro- duced at 10-20C and pH 7.0-7. 5 into the resulting yellow suspension. The yellow suspension is then heated to 72C in the course of one hour and stirred at that temperature for a further 2 h. After the solvent has been distilled off, a further 200 mi of water are added and the mixture is stirred for a further 1.5 h at 85C. After cooling to 75C, the crude product is filtered through a suction filter, washed with 2.5 % NACI solution and dried in vacuo at 80C. Yield : 306.1 G Appearance: yellow crystals
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