Sodium Carbonate → (3-Aminophenyl)(4-aminophenyl)methanone

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To an autoclave there are added 30.7 g (0.1 moles) of 4-chloro-3,4'-dinitro benzophenone, 10.6 g (0.1 moles) of sodium carbonate, 1 g of 5% palladium/alumina catalyst (available from Nihon-Engelhardt Co.) and 250 ml of 1,2-dichloro ethane. With the mixture being stirred at 30°-35° C., the reaction is carried out at a constant pressure for 10 hours by introducing hydrogen into the mixture. After completion of the reaction, the reaction mixture is heated up to 70° C. to be subjected to filtering for removing the catalyst. Then, on cooling, there is obtained 3,4'-diamino benzophenone in the form of yellow needle-like crystals. The crystals are filtered, washed with 20 ml of 1,2-dichloro ethane and dried. Yield 17.6 g (83%). M.P. 121°-122° C. Recrystallization from ethanol gives yellow needle-like pure crystals of said benzophenone. M.P. 122°-122.5° C.

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