Manufacture of dimethylaminobenzenesulfonates

Details Manufacture of dimethylaminobenzenesulfonates Manufacture of dimethylaminobenzenesulfonates

1976-07-22

1979-01-09

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14356, C07C14368

Patent

active

041338286

ABSTRACT:
Dimethylaminobenzenesulfonates are manufactured by reacting nitrobenzenesulfonates with formaldehyde and hydrogen in the presence of a hydrogenation catalyst containing a metal of atomic number from 24 to 29 and of phosphoric acid and water at a pH of from 2 to 3.5, at from 50 to 150.degree. C, under a pressure of at least 40 bars, with a residence time of from 1 to 15 minutes. The products are starting materials for the synthesis of dyes, especially of rhodamine dyes, oxazine dyes and reactive dyes, and also of pharmaceuticals and pesticides.

REFERENCES:
patent: 2322572 (1943-06-01), Fisher
patent: 2784220 (1957-03-01), Spiegler
patent: 3328465 (1967-06-01), Spiegler
Pearson, et al., J. Amer. Chem. Soc., vol. 73, p. 864.

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