反应详情

To a mixture of 52.0 g (0.30 mole) of sulfanilic acid in 225 ml of warm water was added 83 g (0.61 mole) of sodium acetate trihydrate and 75 ml of acetonitrile. Then a solution of 37.1 g (0.19 mole) of 2,4-dichlorobenzyl chloride in 75 ml of acetonitrile was added and the resulting solution refluxed for 31/2 hrs, followed by the dropwise addition of 50 ml of conc. HCl while simultaneously removing 75 ml of acetonitrile by distillation. The reaction mixture was filtered while hot (80° C.) and the same purification sequence utilized as described in the previous example, which gave 34.91 g (55.3% yield) of purified 4-(((2,4-dichlorophenyl)methyl)amino)benzenesulfonic acid as a white powder having a melting point greater than 275° C.

1. temperaturethe resulting solution refluxed for 31/2 hrs
2. customwhile simultaneously removing 75 ml of acetonitrile
3. distillationby distillation
4. filtrationThe reaction mixture was filtered while hot (80° C.)