Process for the preparation of sodium salts of aromatic sulphini

Details Process for the preparation of sodium salts of aromatic sulphini Process for the preparation of sodium salts of aromatic sulphini

1993-11-24

1994-10-25

Chan, Nicky

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfinic or sulfenic acids or salts thereof

C07C31302

Patent

active

053591321

ABSTRACT:
Sodium salts of aromatic sulphinic acids containing nitro groups are obtained in particularly pure form and good yield by introducing the corresponding sulphonyl chlorides into an aqueous alkali metal sulphite solution which is at a temperature of -10.degree. to 45.degree. C. and has a pH of 6 to 10, then cooling the suspension to -10.degree. to 0.degree. C., then metering in sodium hydroxide solution in such a way that the temperature does not exceed 0.degree. C. throughout the reaction, and then raising the temperature, maintaining stirring and simultaneously keeping the pH at 8 to 9 by the addition of sodium hydroxide solution.

REFERENCES:
Organic Chemical Intermediates for Insecticides Fungicides and Rodenticides FIAT Final Report No. 949, British Intelligence Objectives Subcommittee; Oct. 14, 1946; J. T. Thurston; Technical Industrial Intelligence Division U.S. Department of Commerce; 4 pages.

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