Process for the preparation of metallisable azo dyes

Details Process for the preparation of metallisable azo dyes Process for the preparation of metallisable azo dyes

1990-10-11

1992-06-30

Brust, Joseph Paul

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

Organic compounds

Azo

534583, 534602, 534842, C76

Patent

active

051264358

ABSTRACT:
A process for the preparation of azo dyes of formula ##STR1## wherein K is the radical of a coupling component of the benzene or naphthalene series or of the heterocyclic series, and the hydroxy group is attached to K adjacent to the azo group, X is hydrogen or nitro and M is an alkali metal ion or an ammonium ion, which process comprises coupling a diazo component of formula ##STR2## in the presence of a zinc salt and in an inert gas atmosphere, to a coupling component of formula ##STR3## in which formula (2) and (3) above K and X are as defined for formula (1). The process makes it possible to obtain the azo dyes in high yield.

REFERENCES:
patent: 2812321 (1957-11-01), Eberhart et al.
Rys/Zollinger, Farbstoffchemie, pp. 58,59,70 and 71 (1982).
Chem. Abstr. 108:206265x (1988).
Chem. Abstr. 108:188434v (1988).
Chem. Abstr. 108:206266y (1988).
Chem. Abstract 106:178104 (1987) Mitsui, II.
Fiery-David, Grundlegende Operationen der Farbenchem i.e., Springer-Verlag (1952).
Coloranti Azoici, Editura Technica Bucuresti (1981) 330-331.

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