Preparation of 1:2 metal complex dyes by coupling in the presenc

Details Preparation of 1:2 metal complex dyes by coupling in the presenc Preparation of 1:2 metal complex dyes by coupling in the presenc

1988-11-22

1991-02-26

Higel, Floyd D.

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

Organic compounds

Azo

534696, 534697, 534712, 534722, 534724, 534725, 534887, C09B 4501, C09B 4516, C09B 4520

Patent

active

049963031

ABSTRACT:
The invention relates to a process for the preparation of 1:2 metal complex azo dyes of formula ##STR1## wherein each X is hydrogen, halogen or nitro, K and K' are each independently of the other the radical of a coupling component of the benzene, naphthalene or pyrazolone series, Y and Y' are each --O-- or --N(R), wherein R is hydrogen, C.sub.1 -C.sub.4 alkyl or phenyl, Me is chromium or cobalt and Ka is a cation, and Y and Y' are attached to K and K' adjacent to the azo group, by coupling and metallising, which process comprises coupling, in aqueous solution, a diazo component of formula ##STR2## wherein X is as defined for formula (1), in the presence of the 5- to 30-fold molar amount of sodium and/or potassium chloride, based on the molar amount of diazo component, and in the presence of a compound that donates a chromium or cobalt atom, to coupling components of formulae

REFERENCES:
patent: 1480640 (1924-01-01), Straub et al.
patent: 2906746 (1959-09-01), Brassel et al.
patent: 4180502 (1979-12-01), Kaufmann
patent: 4396544 (1983-08-01), Dore
Colorante Azoici, Editura Tehnica Bucuresti, 330-331.

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