Sodium Hydroxide → (3-Aminophenyl)(2-methoxyphenyl)methanone

The 3'-amino-2-methoxybenzophenone may be prepared as follows: Stannous chloride in the dihydrate form (10.3 g) is added, at a temperature between 62° and 66° C., to a suspension of 2-methoxy-3'-nitrobenzophenone (3.9 g) in a mixture of ethanol (40 cc) and concentrated (11.7N) hydrochloric adid (15.2 cc) which is heated to a temperature in the vicinity of 62° C., in the course of 5 minutes. The solution obtained is heated at a temperature in the vicinity of 80° C. for 4 hours, treated with stannous chloride in the dihydrate form (1 g) and heated at a temperature in the vicinity of 80° C. for a further period of 1 hour and then stirred at a temperature in the vicinity of 20° C. for 16 hours. The solvent is evaporated off under reduced pressure (20 mm Hg; 2.7 kPa) at a temperature in the vicinity of 50° C. The residue is dissolved in distilled water (40 cc) and the solution obtained is adjusted, while maintaining the temperature in the vicinity of 10° C., to a pH in the region of 13 by adding an aqueous 10N sodium hydroxide solution (50 cc) and then extracted 3 times with methylene chloride (150 cc in total). The organic extracts are combined, washed twice with distilled water (200 cc in total), dried over anhydrous magnesium sulphate, treated with decolourizing charcoal (0.5 g), filtered and concentrated to dryness under reduced pressure (20 mm Hg; 2.7 kPa at a temperature in the vicinity of 40° C. 3'- Amino-2-methoxybenzophenone (3.4 g) in the form of greenish yellow crystals, m.p. 81° C., is thereby obtained.