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Catalytic oxidation of 2-ethyl-5,6,7,8-tetrahydro-9,10-anthrahydroquinone

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Catalytic oxidation rate of 2-ethyl-5,6,7,8-tetrahydro-9,10-anthrahydroquinone (ETHAHQ) using oxygen in a stirred reactor was studied. It was found that NaOH and some amines exhibit catalytic properties suitable for this oxidation. In the presence of NaOH with its amountof-substance concentration of 2 mmol/l(l)-phase, five times increased reaction rate is achieved. Additionally, mineral acids (sulphuric and phosphoric) and antioxidants (diphenylamine, N-isopropyl4-diphenylamine) were used for a thorough study of partial mechanism steps and their rates during oxidation. Experimental results were used for determination of the rate limiting step of the ETHAHQ oxidation. It was the hydrogen elimination from hydroxyl of hydroquinone.

Affiliations: 1: Department of Organic Technology, Institute of Chemical Technology, Prague, Technickä 5, 166 28, Praha 6, Czech Republic


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