Process for the preparation of cyanoazo compounds by reacting ha

Details Process for the preparation of cyanoazo compounds by reacting ha Process for the preparation of cyanoazo compounds by reacting ha

1974-03-01

1976-08-31

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260155, 260156, 260157, 260158, 260174, 260196, 260207, 2602071, 260208, C09B 4300, D06P 352, D06P 354

Patent

active

039780406

ABSTRACT:
Preparation of azo dyestuffs which possess at least one nitrile group in the ortho-position to the azo bridge, by reacting the corresponding ortho-halogenoazo compounds with CuCN or systems which for CuCN, in the presence of nitrogen bases and optionally of surface-active agents, in an aqueous medium, with replacement of at least one halogen substituent, which is in the orthoposition to the azo bridge, by a nitrile group. Preferably the reaction is carried out as one-pot-process. The dyestuffs prepared by the process, a substantial number of which are known, are useful in dyeing natural and synthetic fiber materials.

REFERENCES:
patent: 1725596 (1929-08-01), Pongrantz
patent: 2128684 (1938-08-01), Vollmann et al.
patent: 2195076 (1940-03-01), Braun et al.
patent: 3259646 (1966-07-01), Harris et al.
patent: 3342804 (1967-09-01), Mueller
patent: 3393191 (1968-07-01), Mueller
patent: 3407189 (1968-10-01), Merian
patent: 3574183 (1971-04-01), Kruckbnberg
patent: 3772267 (1973-11-01), Cornelius et al.
patent: 3821195 (1974-06-01), Putzig
patent: 3876621 (1975-04-01), Hagen et al.
Bacon et al., J. Chem. Soc. (London), Vol. of 1964, pp. 1097-1107.

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