quinone

/kwi-nohn, kwin-ohn/US // kwɪˈnoʊn, ˈkwɪn oʊn //UK // (kwɪˈnəʊn, ˈkwɪnəʊn) //

醌,奎宁,醌类,奎因

Definitions

n.名词 noun

1
Chemistry.
- : a yellow, crystalline, cyclic unsaturated diketone, C6H4O2, formed by oxidizing aniline or hydroquinone: used chiefly in photography and in tanning leather.
- : any of a class of compounds of this type.

The gradation of color is quite pronounced in the case of selenonaphthene quinone.
Thus there is quinone itself, or benzoquinone, which is benzene with two atoms of oxygen replacing two atoms of hydrogen.
Phenanthrene forms a quinone which has been utilized as a source of colouring-matters, but these are comparatively unimportant.
The compound is readily prepared by the action of sulphurous acid or any other reducing agent on the quinone.
The so-called chrysophanic acid found in Xanthoria (Physcia) parietina is not an acid but a quinone and is better termed physcion.