The Thiele-Winter reaction is of interest for synthesis of triacetoxyaromatic precursors of hydroquinones. Liquid acid such as, chlorosulfonic acid and solid acids like heteropolyacids have an efficient catalyst can effectively replace sulfuric acid in acetoxylation reaction of quinones without use of organic solvent at room temperature.

The Thiele-Winter reaction is of interest for synthesis of triacetoxyaromatic precursors of hydroquinones.Solid acids such as heteropolyacids and activated zeolites have an efficient catalyst in acetoxylation reaction of quinones without the use of organic solvent at room temperature. Hydroquinones and substituted hydroquinones was easily oxidized at room temperature in quinones by using (Pc[Co]/K10) and air (1 atm). We have also tested this type of reaction in naphthoquinone series. Many naphthoquinones are natural products with interesting biological properties. The catalytic system (Pc[Co]/K10) in the presence of pure oxygen easily oxidizes the 1,5-dihydroxynaphthalene in Juglone (yield 87 %).

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