反应详情

4 g of NaOH dissolved in 20 ml of water were added to a suspension of 185.5 g (1 mole) of 2-chloro-5-nitrobenzaldehyde in 500 ml of methanol, after which 70 g (1.2 moles) of propionaldehyde were added dropwise while cooling to 10°-15° C. The mixture was stirred for 2 days at room temperature and then neutralized with glacial acetic acid, and the precipitated solid was isolated by filtration under suction, washed with water and dried at 50° C. under reduced pressure to give the product of melting point 99°-102° C. in 78% yield.

1. temperaturewhile cooling to 10°-15° C
2. customthe precipitated solid was isolated by filtration under suction
3. washwashed with water
4. customdried at 50° C. under reduced pressure
5. customto give the product of melting point 99°-102° C. in 78% yield