Abstract: Anthraquinone derivatives which in one of their tautomeric structures correspond to the formula ##STR1## in which A denotes an anthraquinone radical which is free from sulphonic acid groups, is optionally further substituted and preferably consists of at most 5 fused rings,m is a number from 1-4 and preferably 1 or 2,R.sub.1 is hydrogen or a C.sub.1 -C.sub.4 -alkyl group andR.sub.2 is a cyano group or a radical of the formula ##STR2## or a radical of the formula ##STR3## in which formulae R.sub.3 is hydrogen, a straight-chain or branched alkyl group of a cycloalkyl radical,R.sub.4 is a substituent,n is 0, 1, 2, 3 or 4 andp is 0, 1, 2, 3, 4 or 5,processes for their preparation and their use for pigmenting organic macromolecular substances.

Abstract: Heterocyclic compounds of the formula ##STR1## wherein R.sub.1 denotes hydrogen or C.sub.1 -C.sub.4 -alkyl or the two R.sub.1 s together denote CO,R.sub.2 denotes a substituent andn denotes 0, 1, 2, 3 or 4,processes for their preparation, azo pigments prepared therefrom by a coupling reaction with a diazo component of an aromatic or hetero-aromatic amine free from sulphonic acid groups, and the use of these azo pigments for pigmenting organic macromolecular materials and especially in the spin dyeing of polyacrylonitrile.

Abstract: Azomethine pigments of the formula ##STR1## or of the tautomeric formula ##STR2## in which D denotes the radical of an aromatic or heteroaromatic amine which is free from sulphonic acid groups,R.sub.1 denotes hydrogen or C.sub.1 -C.sub.4 -alkyl, in particular methyl, or both the R.sub.1, at the same time, denote CO,R.sub.2 denotes a substituent,m denotes an integer, preferably 1 or 2, andn denotes 0, 1, 2, 3 or 4,a processes for their preparation.

Abstract: Heterocyclic compounds of the formula ##STR1## wherein R.sub.1 denotes hydrogen or C.sub.1 -C.sub.4 -alkyl, or the two R.sub.1 s conjointly denote CO,R.sub.2 denotes a substituent andn denotes 0, 1, 2, 3 or 4 are suitable as coupling components for azo dyestuffs and especially for azo pigments of the formula ##STR2## wherein D denotes the radical of an aromatic or hetero-aromatic amine which is free from sulphonic acid groups andm denotes an integer, preferably 1 or 2, and R.sub.1, R.sub.2 and n have the abovementioned meaning.