Benzidine sulfate → 3,7-Diaminodibenzothiophene-5,5-dioxide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

The title compound was prepared as described in U.S. Pat. Nos. 2,590,632 and 2,620,343. At 10° C., 30 g of benzidine sulfate was added, in portions, to 100 ml of fuming sulfuric acid. After the addition, the reaction was maintained at 70° C. for 18 hours, cooled and poured into 250 g of cracked ice. The beige solid was collected, washed with water and saturated sodium bicarbonate yielding a yellow solid. The yellow solid was stirred with bicarbonate solution 2×, collected, washed with large volumes of water, and dried in vacuo to give 22.66 g (87%) of the desired product.

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