Abstract
The oxidation reactions of hydroquinones, 2-naphthols, or 2,6-di-tert-butylphenol efficiently occurred by catalysis with alumina-supported copper(II) sulfate to give the corresponding benzoquinones, 1,1'-bi-2-naphthols, and 4,4'-diphenoquinone, respectively, in good yields. The synthetic potentiality of the catalytic reactions was demonstrated by easy isolation of the final products using only filtration and solvent evaporation as well as by application to large-scale syntheses of the benzoquinones and binaphthols. The catalysis with alumina-supported copper(II) sulfate was also applied to the oxidative intramolecular coupling of 5,5'-diacenaphthene to the corresponding perylene compound.
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