Tert-Butyl 1,4-dioxo-3,6-diphenyl-1,2,4,5-tetrahydropyrrolo[3,4-c]pyrrole-2-carboxylate

Abstract

The title compound, C23H20N2O4, is a soluble precursor (`latent pigment') of diketopyrrolo­pyrrole pigments. The tert-butoxy­carbonyl group is twisted by 78.5 (1)° with respect to the heterocyclic ring system. In the crystal structure, pairs of mol­ecules form centrosymmetric dimers through N—H⋯O intermolecular hydrogen bonds and are stacked in a herring-bone fashion along the a axis.