but 2.25 g will dissolve in 100 g of boiling ethanol. It is found in nature as the rare mineral hoelite.

Synthesis

There are several current industrial methods to produce 9,10-anthraquinone:
# The oxidation of anthracene. Chromium(VI) is the typical oxidant.
# The Friedel-Crafts reaction of benzene and phthalic anhydride