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EP0201892A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method of making azo compounds

Assignee: Bayer AG
•
Filing: 1986-05-12
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Granted: —
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Expires: 2006-05-12
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Abstract

Abstract Translated from German Ein universell anwendbares Verfahren zur Herstellung von Azofarbstoffen durch oxidative Kupplung besteht darin, daß man die Oxidation in Gegenwart von Redoxvermittlern ("Mediatoren") mit einem Standardpotential von 0,2-1,5 Volt und gegebenenfalls eines zusätzlichen Oxidationsmittels mit einem Standardpotential von 0,25-2,5 Volt durchführt, wobei die Summe der Oxidationsäquivalente mindestens 4 betragen soll. Bevorzugter Redoxvermittler ist Jod. Das Verfahren eignet sich besonders zur Herstellung von heteroaromatischen Azofarbstoffen mit einer anilinischen Kupplungskomponente. A universally applicable process for the production of azo dyes by oxidative coupling consists in that the oxidation in the presence of redox mediators ("mediators") with a standard potential of 0.2-1.5 volts and optionally an additional oxidizing agent with a standard potential of 0, Performs 25-2.5 volts, the sum of the oxidation equivalents should be at least 4. The preferred redox mediator is iodine. The process is particularly suitable for the production of heteroaromatic azo dyes with an aniline coupling component.

Inventors

  • 👤 Rainer Dr. Gerlach

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 18:50
CPC Classifications
C; C09; C09B; C09B27/00; D; D06; D06P; D06P1/00; D06P1/02; D06P1/12

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References Cited (Backward Citations)

GB457718A Cited
GB810736A Cited
GB1104391A Cited
DD100965A1 Cited

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