Quinones

Cyclohexa-3,5-diene-1,2-dione

Anthraquinone (9,10-dioxoanthracene) is an aromatic organic compound. It is a derivative of anthracene. It has the appearance of yellow or light gray to gray-green solid crystalline powder.

1,4-Benzoquinone is the chemical compound with the formula C6H4O2. In pure state, it forms bright yellow crystals with characteristic irritating odor, resembling that of chlorine; impure samples are often dark colored due to the presence of quinhydrone (1:1 complex of quinone with hydroquinone). This nonaromatic six-membered ring compound is the oxidized derivative of 1,4-hydroquinone.[

1,2- Benzoquinone, also cyclohexa-3, 5-diene-1,2-dione, is a ketone, with formula C6H4O2. It is one of the two isomers of quinone, the other being 1,4-benzoquinone. 1,2-Benzoquinone is produced on oxidation of catechol or by ortho oxidation of a phenol.