反应详情

To a room temperature solution of 3-aminobenzophenone (4.0 g, 20.2 mmol) in ethanol (50 mL) was added cyanamide (1.8 mL 50 wt % in water, 23.3 mmol) followed by the dropwise addition of concentrated nitric acid (1.42 mL). The mixture was heated at reflux for 2 hours and then additional cyanamide (1.8 mL, 50 wt % in water, 23.3 mmol) and nitric acid (1.42 mL) were added. The mixture was heated for an additional 1 hour then allowed to cool to room temperature. Ether was added and the precipitate collected on a filter. This material was recrystallized fromethyl acetate/methanol/ether to yield N-(3-benzoylphenyl)guanidinium nitrate (2.5 g, 41%) as a white crystalline solid. 1H NMR (DMSO-d6): δ 9.75 (s, 1 H), 7.76 (d, 2 H), 7.69 (t, 1 H), 7.61 (d, 2 H), 7.58–7.49 (m, 9 H); 13C NMR (DMSO-d6): δ 195.01, 155.76, 138.31, 136.65, 135.80, 132.99, 130.05, 129.71, 128.67, 128.44, 127.39, 125.34; MS m/z 240 (M+1 of free base).

1. temperatureThe mixture was heated
2. temperatureat reflux for 2 hours
3. temperatureThe mixture was heated for an additional 1 hour
4. customthe precipitate collected on a filter
5. customThis material was recrystallized fromethyl acetate/methanol/ether