The β-form of di-tert-butyl 1,4-dioxo-3,6-diphenyl-1,2,4,5-tetrahydropyrrolo[3,4-c]pyrrole-2,5-dicarboxylate

Abstract

The title compound, C28H28N2O6, is a soluble precursor (`latent pigment') of diketopyrrolo­pyrrole pigments. The mol­ecules are stacked along the a axis in a parallel arrangement. The present structure of the β-form is quite different from that of the previously reported α-form [MacLean et al. (2000). J. Chem. Soc. Perkin Trans. 2, pp. 1513–1519].