Anthraquinone is a derivative of anthracene.
Anthraquinone melts at 286°C, boils at 379.8°C. It is insoluble in water or alcohol, but dissolves in nitrobenzene and aniline.
There are several ways to obtain anthraquinone:
- Oxidation of anthracene
- Condensation of benzene with phthalic anhydride in presence of AlCl3 (Friedel-Crafts substitution). The resulting o-benzoylbenzoic acid then undergoes cyclization, forming anthraquinone.
- Diels-Alder reaction (from naphtoquinone and a 1,3-diene)
Anthraquinone is used in production of dyes, such as alizarin.
Many natural pigments are derivatives of anthraquinone.
Last updated: 09-01-2005 12:57:39