Bridged perinones/quinophthalones

Compounds of the general formula (I) or tautomeric forms thereof wherein Ar1 and Ar2 independently of one another denote radicals to complete optionally substituted carbocyclic aromatic rings, B denotes an optionally substituted alkylene group or a radical of the formula wherein r represents a number from 1 to 4, the ends of which are in each case bonded to an aromatic C atom of the two radicals Ar1 and Ar2, and X1 and X2 independently of one another represent a radical of the formulae chosen from the group consisting of these being in each case located in the ring such that the or the group is adjacent to the C-C double bond, wherein Y, Z, Ra and Rb have the meaning, given in the description, are outstandingly suitable for bulk dyeing of plastics.