Claims
- 1. In a process for the preparation of a compound of the formula
- F--SO.sub.2 --CH.sub.2 --CH.sub.2 --OSO.sub.3 H).sub.n
- in which F is the radical of an organic dyestuff molecule and n is the number 1, 2, 3 or 4, by esterification of a compound of the formula
- F--SO.sub.2 --CH.sub.2 --CH.sub.2 --OH).sub.n
- or a salt thereof in which F and n have the above meanings, by a sulfuric acid or sulfur trioxide agent, the improvement which comprises carrying out the reaction in a machine operating with a kneading action and with 1 to 5 times the equimolar amount, calculated on one mol of SO.sub.3, of 92 to 100% strength sulfuric acid or sulfuric acid containing sulfur trioxide or sulfur trioxide itself.
- 2. A process according to claim 1, in which the reaction is carried out at a temperature of between 80.degree. and 120.degree. C.
- 3. A process according to claim 1, wherein 96-100% strength sulfuric acid, or sulfuric acid containing sulfur trioxide, is used as the esterification agent.
- 4. A process according to claim 1, wherein an aminoanthraquinone compound of the formula ##STR167## in which R.sub.1 is hydrogen, lower alkoxy or carboxy and R.sub.2 is hydrogen or lower alkoxy, with the proviso that at least one of the two substituents R.sub.1 and R.sub.2 is hydrogen, or a salt thereof is esterified to yield a compound of the formula ##STR168## in which R.sub.1 and R.sub.2 have the above meanings.
- 5. A process according to claim 4, wherein R.sub.1 and R.sub.2 each is hydrogen.
- 6. A process according to claim 4, wherein R.sub.1 is carboxy and R.sub.2 is hydrogen.
- 7. A process according to claim 4, wherein R.sub.1 is hydrogen and R.sub.2 is methoxy.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2634855 |
Aug 1976 |
DEX |
|
2634909 |
Aug 1976 |
DEX |
|
Parent Case Info
This is a continuation of application Ser. No. 820,851, filed Aug. 1, 1977, now abandoned.
US Referenced Citations (8)
Continuations (1)
|
Number |
Date |
Country |
Parent |
820851 |
Aug 1977 |
|