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

Abstract

The title compound, C23H20N2O 4, 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. © 2005 International Union of Crystallography Printed in Great Britain - all rights reserved.