Process for the preparation of 1-amino-2-naphthol-4-sulfonic aci

Details Process for the preparation of 1-amino-2-naphthol-4-sulfonic aci Process for the preparation of 1-amino-2-naphthol-4-sulfonic aci

1988-05-31

1990-01-09

Chan, Nicky

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

Organic compounds

Sulfonic acids or salts thereof

C07C14366

Patent

active

048929697

ABSTRACT:
Process for the preparation of 1-amino-2-naphthol-4-sulfonic acid by treating 1-hydroxylamino-2-tetralone-4-sulfoniuc acid with an alkali metal pyrosulfite in mineral acid medium in the presence of catalytic amounts of a copper compound.
1-Amino-2-naphthol-4-sulfonic acid is an intermediate for the manufacture of dyes.

REFERENCES:
patent: 4427601 (1984-01-01), Hammerschmidt et al.
Ullmanns Encyclopadie der Technischen Chemie, 4th edition, vol. 17 (1979), p. 100.
N. N. Woroshzow, "Grundlagen der Synthese von Zwischenprodukten und Farbstoffen", Akademie-Verlag, Berlin, 1966, p. 500.
Zaloudek et al., C.A., 64, 15813h (1966)-(Abstract of Czech. 115,051).

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