Sodium Hydroxide → 1,10-Phenanthrolin-5-amine

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In 3.0 ml of acetic acid was dissolved 1.37 g (5.8 mmol) of 5-nitro-1,10-phenanthroline. A solution prepared by dissolving 1.08 g (4.8 mmol) of stannic chloride (II) dihydrate in 2.2 ml of concentrated hydrochloric acid was added dropwise thereto, followed by stirring at 100° C. for 2 hours. The reaction mixture was made alkaline with a NaOH aqueous solution and extracted with chloroform. After chloroform was distilled off under reduced pressure, a yellow solid was obtained. This was recrystallized from tetrahydrofurane-hexane to obtain 0.75 g (66%) of the desired 5-amino-1,10-phenanthroline (Compound (2)).

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