Water → 2-(4-Bromo-phenyl)-N-{4-[2-(4-bromo-phenyl)-2-hydroxy-acetylamino]-phenyl}-2-hydroxy-acetamide

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In a 250 cm3 flask fitted with a consender and a reverse Dean-Stark apparatus, the (4-bromo-phenyl)-hydroxy-acetic acid (25.00 g, 108.2 mmol) and 1,4-phenylenediamine (3.900 g, 36.07 mmol) are dissolved in chlorobenzene (100 cm3). The reaction mixture is heated to 132° C. while the generated water is distilled off the using the reverse Dean-Stark apparatus. After 21 hours, the reaction mixture is cooled down, the precipitate is filtered off and washed with methanol to yield the product (18.21 g, Yield: 95%). NMR (1H, 300 MHz, CDCl3): δ 9.90 (br, 2H); 7.59 (s, 4H); 7.56 (d, J=8.5 Hz, 4H); 7.45 (d, J=8.5 Hz, 4H); 6.53 (d, J=4.7 Hz, 2H), 5.08 (d, J=4.7 Hz, 2H).

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