Nitric Acid → 2,9-Dimethyl-5-nitro-1,10-phenanthroline

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An acid mixture composed of 5 mL nitric acid (GR (Guaranteed Reagent) grade undiluted solution from Wako Pure Chemical Industries Ltd.) and 10 mL sulfuric acid (GR grade undiluted solution from Wako Pure Chemical Industries Ltd.) was added to 0.5 g of 2,9-dimethyl-1,10-phenanthroline (Wako Pure Chemical Industries Ltd.) and the mixture was heated to 115° C. for 1 hour. To the resulting solution, 100 g of ice was added and the pH of the chilled solution was adjusted to 8.0 by the addition of sodium hydroxide. The resulting precipitate was separated by filtration and dried at 110° C. to give 5-nitro-2,9-dimethyl-1,10-phenanthroline as shown by the formula (B) in FIG. 1.

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