Process for the manufacture of cyano azo dyes

Details Process for the manufacture of cyano azo dyes Process for the manufacture of cyano azo dyes

1979-03-26

1981-03-24

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260152, 260205, 260206, 260207, 260208, C09B 4300

Patent

active

042579449

ABSTRACT:
Process for disperse azo dyes having a cyano radical ortho to the azo group by reacting the corresponding halogeno dye with a covalent non-metallic nitrile in the presence of a copper catalyst and an acid acceptor. Previous processes have used a metal cyanide as the cyanide source. The present process does, however, contemplate the use of a non-metallic nitrile, even in small amounts, in combination with a metal cyanide for which advantages are to be gained in terms of reduced copper usage. The non-metallic nitrile is preferably a cyanohydrin which may be prepared in situ by reacting an aldehyde or ketone with a metal cyanide. The metal cyanide may itself provide the copper catalyst.

REFERENCES:
patent: 3821195 (1974-06-01), Putzig
patent: 3978040 (1976-08-01), Gottschlich et al.
patent: 4045430 (1977-08-01), Hamprecht
patent: 4057563 (1977-11-01), Chalkley
patent: 4083846 (1978-04-01), Leverenz
patent: 4126610 (1978-11-01), Belfort

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