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Ernst Hartwig

Reinhold Krallmann

Manfred Ruske

Wolfgang Elser

Karl Maier

Dyes of the formula ##STR1## where Hal is chlorine or bromine, X is hydrogen, hydroxyphenyl or alkoxyphenyl, n is 1 or 2, or, when X is hydroxyphenyl or alkoxyphenyl, may furthermore be O, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another are each unsubstituted or alkoxy-substituted alkyl, and R.sup.1 and R.sup.3 may furthermore be hydrogen, are of high color strength, and very useful for dyeing and printing cellulose-containing fiber material or cellulose swollen by means of water-miscible swelling agents.

Anthraquinone dyes

Anthraquinone dyes of the formula ##STR1## where R is C.sub.1 -C.sub.10 -alkyl, C.sub.5 -C.sub.8 -cycloalkyl, alkoxyalkyl of a total of 3 to 11 carbon atoms, phenoxyalkyl, where alkyl is of 2 to 4 carbon atoms, or phenyl-C.sub.1 -C.sub.4 -alkyl. On synthetic fibers and blends thereof with cellulosic fibers, the dyes give brilliant clear blues. The dyes are particularly suitable for transfer printing onto synthetic fibers and give high color yields. The transfer prints obtained have excellent fastness characteristics.

A process for the production of 1,4-diaminoanthraquinone-2,3-dinitrile by the reaction of a diaminoanthraquinone of the formula (I): ##STR1## in which R.sup.1 and R.sup.2 independently of one another are hydrogen, chloro or bromo, with an ionic cyanide in a polar aprotic solvent, the reaction in the case when R.sup.1 and R.sup.2 are both hydrogen being carried out in the presence of an ammonium salt and the reaction product formed is dehydrogenated or the reaction is carried out with the ionic cyanide under dehydrogenating conditions. The process yields the dinitrile of formula (I) in which R.sup.1 = R.sup.2 = CN in a good yield and high purity. 1,4-diaminoanthraquinone-2,3-dinitrile is a dye and an important starting material for the manufacture of dyes.

Process for the production of 1,4-diaminoanthraquinone-2,3-dinitrile

Anthraquinoid disperse dyes of formula: ##SPC1## In which

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Ernst Hartwig