| 摘要 |
1,140,619. Dimethyl aniline disulphonic acids. CIBA Ltd. 3 Feb., 1967 [7 Feb., 1966], No. 5348/67. Heading C2C. [Also in Division C4] 2,5 - Dimethylaniline - 4,6 - disulphonic acid and 2,3 - dimethylaniline - 4,6 - disulphonic acid are obtained by heating finely powdered acid sulphates of the corresponding dimethyl anilines to form the corresponding monosulphonic acids which are converted into the disulphonic acids by treating with oleum. |
