Crystal structure of 3,13-dimethoxy-5,6,10,11-tetrahydrofuro[3,4-i][5]helicene-7,9-dione

In the crystal, the mol­ecules form a layered structure parallel to (10) via C—H...O hydrogen-bonding inter­actions. Adjacent layers are also linked by C—H...O hydrogen bonds, forming a three-dimensional structure.

3,12-Dimeth­oxy-5,6,9,10-tetra­hydro-[5]helicene-7,8-dicarbo­nitrile

The complete molecule of the title compound, C₂₆H₂₀N₂O₂, is generated by a crystallographic twofold axis. The torsion angle between the terminal and central benzene rings is −32.5 (2)°. The torsion angle along the inner helical rim of the molecule is −18.8 (2)° with each other. The C...C distance between the terminal rings is 3.016 (2) Å. In the crystal, weak C—H...N hydrogen bonds are observed.