Novel naphthoylene-perinones disperse dyestuffs

A dyestuff or a isomeric dyestuff mixture of the formula ##STR334## wherein R.sub.6 represents lower alkyl, lower alkoxy, hydroxy, chlorine or bromine or hydrogen, R.sub.7 represents naphthyl or phenyl or phenyl substituted by lower alkyl, lower alkoxy, phenyl, di (lower alkyl)-amino, nitro, cyano, bromine, chlorine, SO.sub.3 H, SO.sub.2 phenyl, SO.sub.2 N(C.sub.4 H.sub.9).sub.2, COOC.sub.2 H.sub.5 or CON(CH.sub.3).sub.2, [SO.sub.2 N (alkyl C.sub.1 -C.sub.4).sub.2, COO lower alkyl or CON (alkyl C.sub.1 -C.sub.4,] which is bonded in 1,2-position, and one Z represents hydrogen and the other Z represents a radical of the formula ##STR335## in which R is hydrogen or lower alkyl, R.sub.1 is hydrogen, alkyl C.sub.1 -C.sub.6, benzyl or R.sub.1 and R.sub.2 together with the adjacent nitrogen form tetrahydroquinoline, tetrahydroquinoline substituted by lower alkyl or indoline substittued by lower alkyl, and R.sub.2 is alkyl C.sub.1 -C.sub.4, benzyl or phenyl, said isomeric mixture being a mixture of positional isomers resulting from substituents Z, R.sub.6 and R.sub.7 phenyl substituted with said substituents.