1-diazo-2-naphthol-4-sulfonic acid by iron-catalyzed diazotizati

Details 1-diazo-2-naphthol-4-sulfonic acid by iron-catalyzed diazotizati 1-diazo-2-naphthol-4-sulfonic acid by iron-catalyzed diazotizati

1986-03-19

1988-10-11

Higel, Floyd D.

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

Organic compounds

Diazooxide or diazotate

534558, 534559, 534562, 534565, C07C11300, C07C11304

Patent

active

047772468

ABSTRACT:
The invention relates to a process for the preparation of 1-diazo-2-naphthol-4-sulfonic acid by diazotizing 1-amino-2-naphthol-4-sulfonic acid in weakly acid medium and in the presence of iron ions, using only 1 to 30 millimoles of an iron compound per mole of 1-amino-2-naphthol-4-sulfonic acid. Such an insignificant amount is sufficient to protect the 1-amino-2-naphthol-4-sulfonic acid effectively from being oxidized to 1,2-naphthoquinonesulfonic acid and to afford the desired reaction product in good yield.

REFERENCES:
patent: 2031180 (1935-09-01), Koch
patent: 2812321 (1957-11-01), Eberhart et al.
Nesmejanow et al., Ber. Deut. Chem. Gesell., vol. 68, pp. 1877 to 1883 (1935 ).
Saunders, "The Aromatic Diazo-Compounds and Their Technical Applications", Edward Arnold & Co., London, pp. 7 to 9 (1936).

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