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AssigneeCiba-Geigy Corporation
InventorsRudiger Oxenius, Charles Wilhelm
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The invention relates to a process for the preparation of azo compounds of the formula ##STR1## wherein K is the radical of a coupling component, R is a water-solubilising group and X is a fibre-reactive radical, and the benzene ring A may be further substituted, which process comprises reacting a compound of the formula ##STR2## in an aqueous medium containing 5 to 25% by weight of an alkali metal halide or alkali metal sulfate, based on the weight of the medium, with a compound which introduces the radical X to give the compound of the formula ##STR3## diazotising said compound direct and coupling the diazotisation product with a coupling component of the formula H--K (4) in which formulae (2), (3) and (4) A, R, X and K are as defined for formula (1).
A process for the preparation of an azo compound of the formula ##STR30## wherein K is the radical of a coupling component, R is a water-solubilizing group and X is a fibre-reactive radical, and the benzene ring A is unsubstituted or further substituted, which process comprises reacting a compound of the formula ##STR31## in an aqueous medium containing 5 to 25% by weight of an alkali metal halide or alkali metal sulfate, based on the weight of the medium, with an acylating agent XA' wherein X is as previously defined and A' is a halide or an anhydride of an organic acid or an easily replaceable atom or group on a heterocyclic compound to give a compound of formula ##STR32## diazotising said compound direct without isolation or purification and coupling the diazotisation product with a coupling component of the formula
Dependencies are inferred from the claim text.