反应详情

47.4 g of 2-mercaptobenzimidazole are reacted in the same manner as in Example 10 with 40.7 g of itaconic acid in 150 ml of 70% H2SO4 at 40°-43°. After dilution with water, sodium hydroxide solution is added until pH 4 is reached, the product being precipitated as the dihydrate. Anhydrous 3-(benzimidazol-2-ylthio)-propane-1,2-dicarboxylic acid, melting at 165°-168°, is obtained from the dihydrate by recrystallisation.

1. customthe product being precipitated as the dihydrate