Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1987-03-02
1987-12-01
Chan, Nicky
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07C14338
Patent
active
047103221
ABSTRACT:
The invention consists in an improved process for the preparation of salts of benzaldehyde-2,4-disulfonic acid from 2,4-dichlorobenzaldehyde. In the process 2,4-di-chlorobenzaldehyde is reacted with an aqueous solution of an alkali metal or alkaline earth sulfite and/or hydrogensulfite for a reaction time of less than 7 hours at 140.degree.-180.degree. C. to form the corresponding salt of benzaldehyde-2,4-disulfonic acid with high yield. The product has application in the electroplating industry and in the preparation triphenylmethane dyestuffs.
REFERENCES:
patent: 1531507 (1925-03-01), Rosenbaum
Chan Nicky
Hoechst Aktiengesellschaft
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