1,1′,8,8′-Tetra­methoxy-10,10′-bianthrone.

The title compound, 1,1′,8,8′-tetra­methoxy-9,9′-bianthracene-10,10′(9 H,9′H)-dione, C32H26O6, was obtained by the reduction of 1,8-di­methoxy­anthra­quinone with sodium borohydride and tri­fluoro­acetic acid. In the anthrone dimers, the methoxy and carbonyl groups are attached to opposite sides of the anthracene rings. In the solid state, the mol­ecule has a crystallographically imposed centre of symmetry located at the mid-point of the C—C bond linking the two anthracene systems. [ABSTRACT FROM AUTHOR]