Summary Baking the hydrogensulfate salt of 2, 3-dimethylaniline (1) or of 3, 4- dimethylaniline (2) led to 4-amino-2, 3-dimethylbenzenesulfonic acid (4) and 2-amino-4, 5- dimethylbenzenesulfonic acid (5), respectively (Scheme I). The sulfonic acid 5 was also obtained by treatment of 2 with sulfuric acid or by reaction of 2 with amidosulfuric acid. 3- Amino-4, 5-dimethylbenzenesulfonic acid (3) and 5-Amino-2, 3-dimethylbenzenesulfonic ...
