Anthraquinone heated with sulphuric acid and treated with formaldehyde in the usual manner, yields a substance which, when mixed with water, forms an opaque, milky solution.
When the oxidation is complete, the anthraquinone is separated in a filter press, washed and heated to 120 deg.
Anthraquinone crystallizes in yellow needles or prisms, which melt at 277 deg.
When oxidation is complete the crude anthraquinone is separated in filter presses and heated with an excess of commercial oil of vitriol to 120 deg.
In order to synthesize alizarin, they converted anthracene into anthraquinoneand then brominated the quinone.
After the separation of the silver salt (see above) obtained on sulphonating anthraquinone, the remaining acid liquid gives on treatment with calcium carbonate the calcium salt of anthraquinone 2.
It is then oxidized to anthraquinone by means of sodium dichromate and sulphuric acid in leaden vats, steam heated so that the mixture can be brought to the boil.
A more delicate method consists in adding a very littleanthraquinone and sodium amalgam; absolute alcohol gives a green coloration, but in the presence of minute traces of water a red coloration appears.
Isomeric compounds known as "flavopurpurin" and "anthrapurpurin" are also made from the disulpho-acids of anthraquinone by fusion with alkali and potassium chlorate.
So far only the diselenides ofanthraquinone and their phenols are recognized remedies(36).
One of them was prepared from anthraquinone selenocyanide, by the action of ammonia under pressure(30).
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "anthraquinone" in a variety of sentences. We hope that you will now be able to make sentences using this word.
