Alizarin

Name:
Alizarin
Detailed information:

Chemistry name:	1,2-dihydroxyanthraquinone; CI 58000
M Formula:	C6H4(CO)2C6H2(OH)2
Chemistry structure:
Properties:
Orange-red crystals; brownish-yellow powder. Mp 289C, bp 430C (sublimable). Soluble in aromatic solvents, hot methanol, and ether; sparingly soluble in water; moderately soluble in ethanol. Combustible.
Derivation:
Anthracene is oxidized to anthraquinone, the sulfonic acid of which is then fused with caustic soda and potassium chlorate; the melt is run into hot water and the alizarin precipitated with hydrochloric acid. Occurs naturally in madder root.
Grade:
Technical.
Use:
Manufacture of dyes, production of lakes, indicators, biological stain.