Sodium Hydroxide → 1,5-Diamino-4,8-dihydroxyanthraquinone

Beteiligte Stoffe

Reaktionsschritte

A 500 ml. electromagnetically stirred glass reactor was charged with 5.0 g (0.0151 mole) of 1,5-dinitro-4,8-dihydroxyanthraquinone, 100 g of a 4% aqueous solution of sodium hydroxide and 0.25 g of 5% palladium-carbon. The inside of the reactor was purged with hydrogen, and the 1,5-dinitro-4,8-dihydroxyanthraquinone was hydrogenated at 50° C. with stirring. In 5 hours, 0.0906 mole of hydrogen was absorbed, whereupon the reaction was stopped. The reaction mixture was filtered to separate the catalyst. The filtrate was oxidized with air with stirring at 20° to 30° C. for 2 hours, and then neutralized with 20% sulfuric acid to a pH of 2-3. The crystals precipitated were filtered, washed with water, and dried to afford 4.0 g of 1,5-diamino-4,8-dihydroxyanthraquinone in a yield of 97.8%.

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