During the development of a new regiospecific synthetic methodology for 1,5 dihydroxy-
9,lO-anthraquinone, it was observed that (anthrufin) preparative TLC of
1,2,3,4,5,6,7,8-octahydro-9,lO-dihyd roxy- 1,5-anthracenedione on silica gel produced
a well-defined 1:l complex of the dione and an aerial oxidation product of it, the
quinone dimethide 1,2,3,4,5,6,7- hexahydro-9,lO-dihydroxy-1 ,5-anthracenedione;
both the complex and the quinone dimethide were characterised spectroscopically