Water → Chlorthal

Participants

Reaction Steps

6.04 g (0.02 mol) of 2,3,5,6-tetrachloro-1, 4-benzenedicarboxamide and 17.65 g of sulfuric acid, consisting of 12.43 g of 96.3% sulfuric acid (containing 0.0256 mol of water) and 5.22 g of 26% fuming sulfuric acid (containing 0.017 mol of SO3), were charged into a reactor, and a hydrolysis of 2,3,5,6-tetrachloro-1,4-benzenedicarboxamide was performed at 180° C. for 6 hr under atmospheric pressure. The amount of water which was present prior to the reaction was 0.0086 mol because the SO3 in fuming sulfuric acid and the water in sulfuric acid were converted to sulfuric acid according to the formula (IV). After the completion of the reaction, precipitated crystals were collected by filtration, washed with water, and dried. As a result, 2,3,5,6-tetrachloro-1,4-benzenedicarboxylic acid was obtained.

Provenance & Evidence