Preparation of azo dyes from other azo compounds

Child Classifications

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• C09B 43/003
• C09B 43/006
• C09B 43/02 by sulfonation
• C09B 43/04 by nitration
• C09B 43/06 by oxidation
• C09B 43/08 by reduction
• C09B 43/11 by introducing hydrocarbon radicals or substituted hydrocarbon radicals on primary or secondary amino groups (formation of an amino group by reduction, e.g. of a nitro groups, C09B43/08)
• C09B 43/12 by acylation of amino groups
• C09B 43/18 by acylation of hydroxyl group
• C09B 43/28 by etherification of hydroxyl groups
• C09B 43/30 by esterification of —COOH or —SO3H groups
• C09B 43/32 by reacting carboxylic or sulfonic groups, or derivatives thereof, with amines; by reacting keto-groups with amines
• C09B 43/40 by substituting hetero atoms by radicals containing other hetero atoms
• C09B 43/44 by substituting amine groups for hydroxyl groups or hydroxyl groups for amine groups; Desacylation of amino-acyl groups; Deaminating