| abstract |
Pyrrolo [3,4-c] pyrroles of the formula wherein D and E independently of one another hydrogen, C₁-C₁₈-alkyl, C₂-Cyl-alkenyl, C₇-C₁₀-aralkyl, phenyl which is unsubstituted or substituted by chlorine, bromine, C₁-C₆-alkyl, C₁-C₄-alkoxy, trifluoromethyl or nitro , -COO-C₁-C₅-alkyl or a group -COOR₈, wherein R₈ benzyl, piperidyl or a group or is, mean, and X and Y are N-CN or O, at least one of X or Y being N-CN.n n n They are excellent as colorants, i.e. as pigments or as polymer-soluble dyes, for coloring high-molecular organic material. They are characterized by an unexpectedly high solid-state fluorescence.n n n For the meaning of the substituents A and B, reference is made to claim 1. |