Process for the preparation of azo dyestuffs having an aniline-type coupler by aminolysis of the appropriate ether group-containing compounds
AssigneeBayer Aktiengesellschaft
InventorKlaus Leverenz
Life of this patent
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Abstract
An azo dyestuff of the formula ##STR1## wherein D=a diazo component, R.sub.1 and R.sub.2 =alkyl or aralkyl, R.sub.3 =H, R or OR.sub.1 and R.sub.4 =a hydrocarbon radical or acyl, which are prepared in a simple manner by aminolysis with ammonia or an amine of the formula ##STR2## of an azo compound of the formula ##STR3## these dyestuffs dye polyester fibres in blue-green to green shades with good fastness to light.
Claims6
A process for the preparation of a non-ionic azo dyestuff of the formula ##STR69## wherein D represents the radical of a diazo component which contains at least one non-ionic electron-withdrawing substituent selected from the group consisting of CF.sub.3, alkylsulphonyl, arylazo, acyl, CN and, NO.sub.2,
- R.sub.1 and R.sub.2 independently of one another denote hydrogen, unsubstituted alkyl or alkyl substituted by HO or C.sub.1 -C.sub.4 -alkoxy, unsubstituted aralkyl or aralkyl substituted in the aryl portion by OF.sub.3, halogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, or R.sub.1 and R.sub.2 taken together denote a C.sub.4 -C.sub.5 -alkylene group,
- R.sub.3 denotes hydrogen, OR.sub.1 or R.sub.1 and
- R.sub.4 denotes hydrogen, alkyl, aralkyl, aryl, or acyl,
- wherein an azo compound of the formula ##STR70## in which R represents R.sub.1 is reacted with ammonia or an amine of the formula ##STR71## wherein said reaction is carried out in water, an organic solvent or in aqueous-organic media at a temperature of from 50.degree.-150.degree. C.
A dyestuffs of the formula ##STR75## wherein Z.sub.1 =C.sub.1 -C.sub.4 -alkyl,
- Z.sub.2 =C.sub.1 -C.sub.4 -alkyl,
- Z.sub.3 =H, Z.sub.4, --SO.sub.2 --Z.sub.4 or ##STR76## and Z.sub.4 =C.sub.1 -C.sub.4 -alkyl.
Dependencies are inferred from the claim text.