Process for the preparation of azo dyes by carrying out coupling

Details Process for the preparation of azo dyes by carrying out coupling Process for the preparation of azo dyes by carrying out coupling

1988-08-29

1991-06-25

Lee, Mary C.

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

Organic compounds

Azo

534583, 534602, 534728, 534780, 534841, 534842, 534883, 534887, C09B 2902, C09B 4100

Patent

active

050268309

ABSTRACT:
Process for the preparation of azo dyes of the formula ##STR1## in which K is the radical of a coupling component of the benzene or naphthalene series or of the heterocyclic series in which the hydroxyl group is attached to K in a position adjacent to the azo group, X is hydrogen or nitro and M is an alkali metal ion or ammonium ion, which comprises coupling a diazo component of the formula ##STR2## in the presence of an alkali metal chloride and ammonium chloride with a coupling component of the formula (3) ##STR3## K and X in the formulae (2) and (3) being as defined under formula (1). The present invention allows the preparation of the said azodyes in high yields.

REFERENCES:
patent: 2812321 (1957-11-01), Eberhart et al.
patent: 3948879 (1976-04-01), Dore
Fierz-David, H. "Fundamental Processes of Dye Chemistry", Interscience Publishers, New York (1949) p. 251.
Zollinger, H., "Azo and Diazo Chemistry", Interscience Publishers New York, p. 250 (1961).
Franke et al., Chemical Abstracts, vol. 105, No. 228492j (1986).
Coloranti Azoici, Editura Technica Bucuresti (1981) pp. 330-331 (Floru et al.).

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