Process for the preparation of cyano-azo dyestuffs

Details Process for the preparation of cyano-azo dyestuffs Process for the preparation of cyano-azo dyestuffs

1981-01-07

1982-09-07

Warren, Charles F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260155, 260156, 260157, 260158, 260165, 260205, 260206, 260207, 2602071, 2602075, C07C10704, C07C10706, C09B 4300

Patent

active

043483194

ABSTRACT:
The invention relates to a process for the preparation of azo dyestuffs containing a cyano group in the ortho-position relative to the azo bridge, by reacting corresponding orthohalogeno-azo dyestuffs with metal cyanides in an aqueous medium in the presence of phase transfer catalysts, such as those from the series of quaternary ammonium and phosphonium salts and also tertiary sulphonium salts.
Compared with known processes for the preparation of o-cyano-azo dyestuffs the new method has the advantage of simpler, cheaper handling, improved yields and lesser pollution problems.

REFERENCES:
patent: 3876621 (1975-04-01), Hagen et al.
patent: 3978040 (1976-08-01), Gottschlich et al.
Ullmanns Encyklopadie der technischen Chemie, Edition II, vol. 16, Urban & Schwarzenberg: Munchen-Berlin, 1965, pp. 724-742.
Ullmanns Encyklopadie der technischen Chemie, Edition II, vol. 9, Urban & Schwarzenberg: Munchen, 1957, pp. 297-304.
Starks, "Journal of the American Chemical Society", vol. 93, 1971, pp. 195-199.
Ullman, vol. 16, pp. 724-726.

Affiliated with

Also associated with

Rating

Process for the preparation of cyano-azo dyestuffs does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of cyano-azo dyestuffs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of cyano-azo dyestuffs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1341612