Process for preparing p-toluidine-2-sulphonic acid

Details Process for preparing p-toluidine-2-sulphonic acid Process for preparing p-toluidine-2-sulphonic acid

1986-04-04

1988-01-05

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14358

Patent

active

047175141

ABSTRACT:
P-Toluidine-2-sulphonic acid (5-amino-2-methylbenzenesulphonic acid) is obtained in very pure form and virtually free of p-toluidine-3-sulphonic acid (2-amino-5-methylbenzenesulphonic acid) by reacting p-toluidine at 10.degree.-55.degree. C. with oleum in sulphuric acid. The molar ratio of SO.sub.3 to p-toluidine in this reaction is 1-3.0:1. The reaction mixture is worked up by pouring into water and filtering off the precipitated p-toluidine-2-sulphonic acid.

REFERENCES:
Muramoto et al., J. Chem. Soc. of Japan, 1975, pp. 1070-1075.
Chien et al., J. of the Chinese Chem. Soc., vol. 4, 355 (1936).
Liebigs Annalen der Chemie, Band 265, 1891, Seiten 67-87, Weinheim, DE; A. Claus et al.: "Uber die Orientirungsfolge bei der Substitution mehrfach substituirter Benzolderivate" Seiten 82-83.

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