Process for the preparation of vat dyes
AssigneeCiba-Geigy Corporation
InventorAthanassios Tzikas
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Abstract
The present invention relates to a process for the preparation of vat dyes of the formula ##STR1## in which A is a vattable radical, X is an acyl radical and Y' is a halogen atom, an amino group or an aryloxy group, which comprises acylating compounds of the formula ##STR2## in which A is as defined under formula (1) and Y is a halogen atom, with an acylating agent which contains the acyl radical X, and, if desired, subjecting the compounds of the formula (2), before or after acylation, to a condensation reaction with an amine or an aromatic hydroxy compound.
Claims7
In a process for the preparation of a vat dye of the formula ##STR243## in which A is a vattable radical, X is an acyl radical of an aromatic carboxylic acid or an alkanoyl radical and Y' is an amino group or an aryloxy group which comprises reacting a compound of the formula
- A-NH.sub.2
- with a 2,4,6-trihalogeno-s-triazine of the formula ##STR244## in which Y is a halogen atom, in a molar ratio of 1:1, subjecting the resulting primary condensation product to a condensation reaction with a diaminoanthraquinone or a mixture of diaminoanthraquinones of the formula ##STR245## in a molar ratio of 1:1 to form a compound of the formula ##STR246## acylating the compound of formula (2) by reacting with an acylating agent which contains the radical X, and subjecting the resultant product to a condensation reaction with an amine or an aromatic hydroxy compound to form the vat dye of formula (1), the improvement wherein the reaction of the compound of formula (2) with the acylating agent is carried out immediately following the preparation of the compound of formula (2) without intermediate isolation of the compound of formula (2).
Dependencies are inferred from the claim text.