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13.6 G. 3-cyanodibenzo[b,f]thiepin-5,5-dioxide are refluxed for 2.5 hours in a mixture of 20 cc. 10% aqueous sodium hydroxide solution and 20 cc. ethanol. The mixture is diluted with water and acidified with concentrated HCl. The acid precipitates as a white solid. The yield of acid, m.p. 268° C.-270° C., is 1.38 g. (94.6%).

1. customThe acid precipitates as a white solid