CAS:81-48-1
Molecular Formula:C21H15NO3
Molecular Weight: 329.35g/mol
Quinizarin is a orange-red crystalline compound. It is soluble in ethanol, diethyl ether, benzene and hot water. It has an only limited solubility in cold water. Quinizarin can be oxidized to form 1,4,9,10-anthradiquinone by led tetraacetate.
Commercially quinizarin is prepared by interaction of 4-chlorophenol with phthalic anhydride at 190-195°C. Reaction is catalyzed with solution of boric acid H3BO3 in 100% sulfuric acid or diluted oleum. Quinizarin is refined by sublimaton or recrystallization.
Uses
Quinizarin is an intermediate in making violet, green, blue dyestuff for wool, including indanthrene and alizarin derivatives.
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