Process for the preparation of 4,4'-dinitrostilbene-2,2'-disulph

Details Process for the preparation of 4,4'-dinitrostilbene-2,2'-disulph Process for the preparation of 4,4'-dinitrostilbene-2,2'-disulph

1986-05-09

1987-07-14

Siegel, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14324

Patent

active

046801464

ABSTRACT:
4,4-40 -Dinitrostilbene-2,2'-disulphonic acid salts are prepared by the oxidation of 4-nitrotoluene-2-sulphonic acid or salts thereof in an aqueous alkaline medium, by adding potassium, calcium and/or magnesium ions during the reaction at the rate of which 4,4'-dinitrostilbene-2,2'-disulphonic acid is formed, the amount of added potassium, calcium and/or magnesium ions at any point during the reaction being 10 to 150 mol %, relative to the amount of 4,4'-dinitrostilbene-2,2'-disulphonic acid present in the reaction mixture at that particular time, and by removing the precipitated salt of 4,4'-dinitrostilbene-2,2'-disulphonic acid.

REFERENCES:
Bender et al., Ber., 19, 3234.
Fischer et al., Ber., 26, 2233.

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