Manufacture of anthraquinones
AssigneeBASF SE
InventorsFranz Merger, Theodor Jacobsen, Heinz Eilingsfeld, Ernest Miesen, Gerhard Nestler
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Abstract
Anthraquinones are manufactured by cyclizing o-benzoylbenzoic acids in the presence of oxygen-containing compounds of aluminum and silicon at elevated temperatures. The products are starting materials for the manufacture of dyes.
Claims13
A process for the manufacture of anthraquinones of the formula ##STR4## where the individual R's may be identical or different and each R is selected from the group consisting of hydrogen, halogen and alkyl, by cyclizing an o-benzoylbenzoic acid of the formula ##STR5## where R has the above meanings, at elevated temperatures, in which the cyclization is carried out in the presence of a cyclizing agent of an oxygen-containing compound of aluminum and of silicon at a temperature of from 150.degree. to 350.degree. C.
Dependencies are inferred from the claim text.