Sulphur dyestuffs of the carbazole series
AssigneeCassella Aktiengesellschaft
InventorsSteffen Piesch, Wolf Weidemuller
Life of this patent
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Abstract
Carbazoleazomethines are prepared and sulfur dyestuffs are prepared by sulphurizing a carbazoleazomethine of the formula ##STR1## wherein R.sup.1 is hydrogen, hydroxyl, halogen, nitro, alkyl having 1 to 8 carbon atoms, alkoxy having 1 to 8 carbon atoms, dialkylamino having 1 to 4 carbon atoms per alkyl, alkanoyloxy having 1 to 8 carbon atoms, benzoyloxy, alkanoylamino having 1 to 8 carbon atoms or benzoylamino; R.sup.2 is hydrogen, hydroxyl, halogen, alkyl having 1 to 8 carbon atoms or alkoxy having 1 to 8 carbon atoms; R.sup.3 is hydrogen or alkyl having 1 to 7 carbon atoms; R.sup.4 is hydrogen or halogen; and R.sup.5 is hydrogen or alkyl having 1 to 8 carbon atoms.
Claims3
Sulphur dyestuffs prepared by sulphurizing a carbazole derivative according to the boil-melt or bake-melt sulphurization process wherein said carbazole derivative is a carbazoleazomethine of the formula ##STR17## wherein R.sup.1 is hydrogen, hydroxyl, halogen, nitro, alkyl having 1 to 8 carbon atoms, alkoxy having 1 to 8 carbon atoms, dialkylamino having 1 to 4 carbon atoms per alkyl, alkanoyloxy having 1 to 8 carbon atoms, benzoyloxy, alkanoylamino having 1 to 8 carbon atoms or benzoylamino;
- R.sup.2 is hydrogen, hydroxyl, halogen, alkyl having 1 to 8 carbon atoms or alkoxy having 1 to 8 carbon atoms;
- R.sup.3 is hydrogen or alkyl having 1 to 7 carbon atoms;
- R.sup.4 is hydrogen or halogen;
- and
- R.sup.5 is hydrogen or alkyl having 1 to 8 carbon atoms.
Dependencies are inferred from the claim text.