反应详情

温度

60 °C

2-Carboxyfluorene (2.8 g, 0.014 mole) was dissolved in anhydrous dimethylformamide (DMF, 133 mL). Potassium t-butoxide (12.5 g, 0.11 mole) and ethyl formate (400 mL) were added to the reaction solution. The temperature of the solution was increased to 60° C. for 5-10 minutes. The reaction solution was cooled to room temperature. Total reaction time was three hours. Ethyl formate was distilled off and 1M hydrochloric acid (150 mL) was added to the reaction mixture. The solid was filtered and washed with distilled water. The precipitate was dried overnight under reduced pressure with phosphorous pentoxide present. NMR confirmed the structure by the appearance of one new proton at δ11.47 ppm (aldehyde hydrogen).

1. temperatureThe reaction solution was cooled to room temperature
2. distillationEthyl formate was distilled off
3. addition1M hydrochloric acid (150 mL) was added to the reaction mixture
4. filtrationThe solid was filtered
5. washwashed with distilled water
6. dry with materialThe precipitate was dried overnight under reduced pressure with phosphorous pentoxide present