Quinones

Naphthoquinone, or more precisely 1,4-naphthoquinone, is an organic compound. It forms yellow triclinic crystals and has an odor similar to benzoquinone. It is sparingly soluble in cold water, slightly soluble in petroleum ether, and freely soluble in most polar organic solvents. In alkaline solutions it produces a reddish-brown color. Because of their aromatic stability,

Benzoquinone, sometimes referred to simply as "quinone", is either of the two isomers of cyclohexadienedione. These compounds have the molecular formula C6H4O2. Orthobenzoquinone is the 1,2-dione, whereas parabenzoquinone is the 1,4-dione. Orthobenzoquinone is the oxidized form of catechol (1, 2-dihydroxybenzene), while parabenzoquinone is the oxidized form of hydroquinone.