Manufacture of alkylanthraquinones

Details Manufacture of alkylanthraquinones Manufacture of alkylanthraquinones

1981-10-26

1983-09-13

Gantz, Delbert E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4968

Patent

active

044041403

ABSTRACT:
A process for preparing alkylanthrquinones wherein the alkyl group contains from 2 to 5 carbon atoms such as 2-ethylanthraquinone, 2-t-amylanthraquinone or 2-t-butylanthraquinone by ring closure from the corresponding alkylbenzoylvenzoic acid is disclosed. The process involves adding a solution of the alkylbenzoylbenzoic acid to 100% concentrated sulfuric acid or up to 12% oleum, distilling off the solvent at from 20.degree. to 60.degree. C., heating the remaining solution to from 80.degree. to 95.degree. C. and preferably from 83.degree. to 87.degree. C. for 3 to 5 hours, diluting the remaining reaction mixture with water and separating the alkylanthraquinone product.

REFERENCES:
patent: 3032560 (1962-05-01), Dawsey
patent: 4035396 (1977-07-01), Milano
patent: 4045456 (1977-08-01), Merger et al.

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