Defn: The hypothetical radical of certain quinone derivatives related to rhodizonic acid.
Defn: A green crystalline substance formed by the union of quinone with hydroquinone, or as an intermediate product in the oxidation of hydroquinone or the reduction of quinone.
Defn: Any one of a group of quinone compounds obtained respectively by the oxidation of certain xylidine compounds.
Defn: A radical of which quinone is the hydride, analogous to phenyl.
In 1877, however, Nietzki worked out a very good process for the preparation of quinone from aniline by oxidation with sulphuric acid and bichromate of soda in the cold.
With this exception no other quinone derivative is used in the colour industry till we come to the hydrocarbons of the anthracene oil.
The quinone is purified, converted into a sulpho-acid, and the sodium salt of the latter on fusion with alkali gives alizarin, which is dihydroxy-anthraquinone.
Preparation of quinone from aniline by Nietzki, utilized in photography in 1880 for manufacture of hydroquinone.
Phenanthrene forms a quinone which has been utilized as a source of colouring-matters, but these are comparatively unimportant.
The quinone with which we are at present concerned is anthraquinone.
Thus there isquinone itself, or benzoquinone, which is benzene with two atoms of oxygen replacing two atoms of hydrogen.
The name was changed to quinone by Woehler, and, as we have already seen (p.
This placed the production of quinone on a manufacturing basis, so that when a demand for hydroquinone sprung up, the wants of the photographer were met by the technologist.
Other Methods of Preparation Quinone may be prepared by the oxidation of aniline with dichromate or manganese dioxide and sulfuric acid.
The precipitate ofquinone is transferred to a 1-l.
The mixture is now heated with stirring on a steam-bath, and as soon as most of the quinone has dissolved the benzene layer is decanted into another beaker.
This, as well as the benzene from the final filtration of the quinone crystals, may be used in a subsequent run and thus raises the yield of the subsequent runs to about 85-90 g.
As soon as the quinone starts to separate, the residue in the flask is transferred to a beaker and cooled in an ice bath.
It may be noted that quinone only effects pseudo-tannage; quinone mixed with water deposits, in time, a black amorphous substance practically insoluble in water.
Condensation of Phenols Condensation of Hydroxybenzene Condensation of Dihydroxybenzene Trihydroxy benzene Polyhydroxybenzenes Quinone Phenolic Ethers Nitro Bodies Amino Bodies Aromatic Alcohols Aromatic Acids 3.
The hypothetical radical of certain quinone derivatives related to rhodizonic acid.
A green crystalline substance formed by the union of quinone with hydroquinone, or as an intermediate product in the oxidation of hydroquinone or the reduction of quinone.
A radical of which quinoneis the hydride, analogous to phenyl.
Any one of a group of quinone compounds obtained respectively by the oxidation of certain xylidine compounds.
Three parts of the quinone di-imine combine with themselves, forming a substance of a brown-black color, which was formerly regarded as the final oxidation product.
The various pathological conditions mentioned before may be ascribed to irritation caused by quinone di-imine.
Quinone di-imine has a very sharp, penetrating odor, and produces violent local irritations wherever it comes in contact with the mucous membrane.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "quinone" in a variety of sentences. We hope that you will now be able to make sentences using this word.
