Various synthetic processes have been used for the preparation of anthraquinone.
anthraquinone crystallizes in yellow needles or prisms, which melt at 277 C.
One of them was prepared from anthraquinone selenocyanide, by the action of ammonia under pressure.
The anthraquinone thus produced is washed and dissolved at a moderate heat in sulphuric acid.
The quinone with which we are at present concerned is anthraquinone.
So far only the diselenides of anthraquinone and their phenols are recognized remedies.