Dissolve 27 g of p-toluidine to 135 g of conc. sulfuric acid cooled to -5°C with stirring. Then prepare a nitrating solution by combining 90 g of conc. sulfuric acid and 25 g of conc. nitric acid cooled to -10°C. Start slow addition of the nitrating solution with stirring while maintaining the temperature of the mixture below -6°C. The mixture should be stirred in -5°C for 24 h and then poured to 400 g of ice. Then the mixture is filtered, washed with 150 mL of water and dried.
Small sample of the product