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At 50° C., 45.0 g (1.13 mol) of sodium hydroxide in 600 ml of water were added dropwise to a solution of 106.0 g (0.32 mol) of dimethyl tert-butylsulfamoylterephthalate in 1600 ml of methanol. The mixture was stirred at reflux temperature for 2 h and evaporated, the residue was taken up in approximately 500 ml of water and a pH of 1 was established using conc. hydrochloric acid. The precipitated solid was filtered off with suction and dried. This gave 87.4 g (90% of theory) of tert-butylsulfamoylterephthalic acid of m.p. 210-213° C.

1. temperatureat reflux temperature for 2 h
2. customevaporated
3. filtrationThe precipitated solid was filtered off with suction
4. customdried