Verfahren zur Herstellung von Anthrachinonfarbstoffen

In examples, the N-methylol compounds of 2-chloro-, 4-chloro-, 2:4-dichloro-, 2-bromo-, 2:4-dibromo-, 2-nitro-, 4-nitro-, 4-t-butyl-, 2:4-dimethyl-and 3:4-dimethyl-benzamide, diphenyl carboxylic acid amide and 2-naphthoic acid amide are made by reacting the corresponding amide with formaldehyde in alkaline aqueous/alcoholic solution. ALSO: The invention comprises dyes of the general formula where A is the radical of an anthraquinone dyestuff, B is a divalent aromatic radical bound to the anthraquinone nucleus by a nitrogen, oxygen or sulphur atom, X is the acyl radical of an aromatic monocarboxylic acid and m is 1 or 2 and n is 1, 2 or 3. The dyes are made by treating an anthraquinone compound having one or two aromatic radicals bound by way of nitrogen, oxygen or sulphur and carrying at least one hydrogen atom bound to the aromatic nuclei with the N-methylol compound of an aromatic carboxylic acid amide or the ester thereof or with the corresponding di-(aroylamidomethyl)-ether in the presence of a condensing agent until one or two -B-CH2-NH-X radicals are formed and when no sulpho group is present, sulphonating the product. The product may also be subjected to bromination. Instead of using the N-methylol compound as above, a mixture of formaldehyde or a polymer thereof and the aromatic amide may be used. When B is bound to the anthraquinone nucleus via -NH-, the dyes may be made by reacting an anthraquinone compound having one or two mobile nuclear halogen substituents with one or two aromatic amines which carry a substituent X-NH-CH2-. Examples are given. The dyes dye leather, silk, superpolyamide and superpolyurethane fibres and wool from acid to neutral solution in blue green and violet shades.