Reactive disazo dyestuffs which contain two heterocyclic reactive groups

A reactive dyestuff having the general formula (1) ##STR41## in which K.sup.1 and K.sup.2 denote coupling components which are identical or different,

• D.sup.1 and D.sup.2, independently of one another, represent a substituted or unsubstituted benzene or naphthalene radical,
• R.sub.a and R.sub.b, independently of one another, denote hydrogen or substituted or unsubstituted C.sub.1 -C.sub.4 -alkyl,
• B.sup.1 and B.sup.2, independently of one another, represent a direct bond or a bridging member,
• Z.sup.1 and Z.sup.2, independently of one another, represent a pyrimidine reactive group containing chlorine or fluorine as the leaving group, or represent 2,3-dichloroquinoxaline-6-carboxyl,
• represents SR.sup.1, OR.sup.2, or ##STR42## in which, R.sup.1 denotes substituted or unsubstituted C.sub.1 -C.sub.4 -alkyl, substituted or unsubstituted phenyl, naphthyl or 2-benzthiazolyl,
• R.sup.2 represents hydrogen, substituted or unsubstituted C.sub.1 -C.sub.4 -alkyl or substituted or unsubstituted phenyl or naphthyl,
• R.sup.3 represents hydrogen or an aliphatic, cycloaliphatic, heterocyclic or araliphatic radical, and
• R.sup.4 has the meaning of R.sup.3 or represents an aromatic radical,
• or in which R.sup.3 and R.sup.4, with the inclusion of a further hetero atom, optionally form a 5- or 6-membered ring.