反応 #82849
ord-8a83f0cae2474a6a883719f7c76826e5
反応方程式
反応条件
後処理
- 1温度while maintaining the temperature between 10°-15° C
- 2温度maintaining the temperature below 5° C.
- 3その他A yellow solid precipitated (nitrostyrene)
- 4ろ過this was collected by filtration
- 5洗浄washed with water (1.5 L) until the filtrate
- 6その他dried
- 7その他recrystallized from hot ethanol (3 L)
実験手順
To a stirred solution of piperonal (75 g, 500 mmol) in methanol (120 mL) at 10° C. was added nitromethane (27.1 mL, 500 mmol, 1 eq) followed by the dropwise addition of sodium hydroxide (21 g, 525 mmol, 1.05 eq) in sufficient water to achieve a total volume of 50 mL while maintaining the temperature between 10°-15° C. The reaction mixture became cloudy, turning to a thick paste. The mixture was stirred for 30 minutes upon completion of the addition, and the mixture was then diluted with ice-water (~350 mL) maintaining the temperature below 5° C., until solution was achieved. The resultant solution was poured in a narrow stream (such that it just failed to break into drops) into a rapidly stirred solution of 36% hydrochloric acid (100 mL)in water (150 mL). A yellow solid precipitated (nitrostyrene), and this was collected by filtration, washed with water (1.5 L) until the filtrate was neutral. The filter cake was air dried and then recrystallized from hot ethanol (3 L) to yield E-2-(3,4-methylenedioxy)-nitrostyrene as yellow needles (53 g, 55%). 1H NMR (300 MHz, CDCl3) δ 7.94 (1 H, d, J=13.5 Hz), 7.47 (1 H, d, J=13.5 Hz), 7.09 (1H, dd, J=7.5&2 Hz), 7.01 (1 H, d, J2 Hz), 6.87 (1H, d, J=7.5 Hz), 6.06 (2H, s). MS (DCl/NH3) m/e 194 (M+H)+, 211 (M+H+NH3)+.