Water-insoluble reactive dyestuffs which are soluble in aprotic solvents

Valuable reactive dyestuffs containing no acid, salt-forming, water-solubilizing groups and which, among others, can be applied from organic solvents, especially aprotic solvents correspond to the formula X1 D-Q-R-N ANGLE X2 wherein D represents the radical of an organic dyestuff, Q represents the bridging member -NX3-, -O-, -S- or -NX3CO-, whereby X3 denotes hydrogen or a lower alkyl group, R represents the radical of a nitrogen heterocycle containing at least one substituent which can be split off as anion and which is bound to a ring carbon atom adjacent to a tertiary nitrogen atom, X1 represents hydrogen, an alkyl or an alkoxyalkyl group and X2 represents an alkyl or an alkoxyalkyl group having in all at least 4 carbon atoms, whereby X1 and X2 must together contain, when X1 denotes an alkyl or an alkoxyalkyl group, at least 8 carbon atoms, OR X1 represents a cyclohexyl radical, unsubstituted or substituted by lower alkyl groups having preferably 1 to 4 carbon atoms, and X2 represents an unsubstituted or substituted alkyl group having at most 18 carbon atoms, a lower alkenyl group having preferably 1 to 4 carbon atoms or a cyclohexyl radical, unsubstituted or substituted by lower alkyl groups having preferably 1 to 4 carbon atoms. Fiber materials dyed with these dyestuffs exhibit very good fastness properties, especially fastness to wet processing, rubbing and dry-cleaning.