Abstract
The catalytic oxidation of naphthalenes was investigated. Hydrogen peroxide (30% aqueous) was used as an oxygen source, and 2,2’-dinitro-4,4’-ditrifluoromethyldiphenyl diselenide was the oxygen-transfer catalyst. Unsubstituted naphthols produce trans-2-carboxycinnamic acid in nearly quantitative yields. Both naphthols bearing substituents on the conjugated ring deliver corresponding trans-2-carboxycinnamic acids in good to excellent yields. The 1,7- and 2,6-hydronaphthoquinones, substituted by carboxy and carboxymethyl groups, produce hydroxycinnamic acids in satisfactory to excellent yields. A catalytic domino reaction mechanism is proposed.
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