Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1976-04-08
1978-04-11
Warren, Charles F.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260205, 260206, 260207, 2602075, 260208, 260141, C09B 4300, C09B 2908, C09B 2926
Patent
active
040838463
ABSTRACT:
The invention relates to the preparation of azo dyestuffs which are free from sulphonic acid groups by diazotization, coupling and subsequent nucleophilic exchange of a halogen atom of the diazo component is in the o-position relative to the azo group. The process is characterized in that all the reaction steps are carried out in a neutral organic dipolar solvent, with the proviso that when using diazo components which are not diazotizable, or only incompletely diazotizable, in dilute aqueous mineral acids, the diazotization medium employed consists of aprotic solvents which do not undergo any chemical reaction with the diazonium salt of this component. The new process is distinguished by less contamination of the effluent.
REFERENCES:
patent: 2209985 (1970-08-01), Lubs
patent: 3459730 (1969-08-01), Schnabel et al.
patent: 3637651 (1972-01-01), Baron et al.
patent: 3793305 (1974-02-01), Balon
patent: 3888841 (1975-06-01), Spietschka et al.
patent: 3962209 (1976-06-01), Gotteschlich et al.
Wagner, et al., Synthetic Organic Chemistry, John Wiley & Sons, Inc., New York, 1953, p. 772.
Parker, "Quarterly Reviews," vol. XVI, No. 2, 1962, p. 163.
Bayer Aktiengesellschaft
Warren Charles F.
LandOfFree
Process for the preparation of 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 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 azo dyestuffs will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-988512