To a mixture of 4.9 g of 2,4-diaminobenzoic acid, 12 g of sodium acetate, 90 ml of methylene chloride and 90 ml of water was added 19.2 g of 2-acetoxybenzoylchloride while stirring at 5° - 10°C, followed by continuing the stirring at 5° - 15°C for 4 hours. The precipitated crystals were recovered by filtration, washed with water and then with methylene chloride and thoroughly mixed with 70 ml of methanol. To the mixture was added 30 ml of water, followed by allowing to stand to precipitate crystals. The crystals were recovered by filtration and recrystallized from 90% aqueous methanol to obtain 7.5 g of 2,4-bis(2'-acetoxybenzamido)-benzoic acid having a melting point between 194° - 195°C.
