Process for the preparation of alkali metal and alkaline earth s

Details Process for the preparation of alkali metal and alkaline earth s Process for the preparation of alkali metal and alkaline earth s

1985-09-13

1987-12-29

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14338

Patent

active

047159952

ABSTRACT:
The invention consists in a single-pot process for the preparation of benzaldehyde-2,4-disulfonic acid salts from 2,4-dichlorobenzal chloride, 2,4-dichlorobenzal chloride being reacted with an aqueous solution of an alkali metal or alkaline earth sulfite and/or hydrogensulfite in the presence of acid-bonding substances at 140.degree.-180.degree. C. Benzaldehyde-2,4-disulfonic acid and its salts are used in the electroplating industry and in the preparation of triphenylmethane dyestuffs.

REFERENCES:
patent: 1531507 (1925-03-01), Rosenbaum
Weygand/Hilgetag, "Preparative Organic Chemistry", John Wiley & Sons, New York, Gd. Hilgetag & Martini 1972, pp. 338-339.

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