Acta Cryst. (2003). E59, o474-o475  [ doi:10.1107/S1600536803005324 ]

Di-tert-butyl 7,14-dihydro-7,14-dioxoquino[2,3-b]acridine-5,12-dicarboxylate

J. Mizuguchi

Abstract: The title compound, C₃₀H₂₈N₂O₆, is a soluble precursor (`latent pigment') of quinacridone pigments. The molecule has inversion symmetry. The tert-butoxycarbonyl group attached to the N atom of the acridine skeleton is twisted by 55.57  (8)° from the heterocyclic ring to which it is attached. The condensed ring system is not entirely planar, and the dihedral angle between the cental benzene ring and the neighboring ring is 174.56  (6)°.

Online 21 March 2003

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