Benzene, 1-isothiocyanato-4-nitro- → N-Cyano-N'-(4-nitrophenyl)thiourea

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The suspension of monosodium cyanamide (6.4 g, 100 mmol) in absolute ethanol (170 mL) was slowly treated with (4-nitrophenyl)isothiocyanate (12.5 mL, 104.5 mmol). The reaction was allowed to stir at room temperature for 1 hour and then heated at 75° C. for 4 hours. The reaction was cooled to room temperature and the colorless solid was filtered and washed with ethanol to give the title A compound (13.6 g), m.p. >250° C.

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