反应详情

da) 0.38 ml of 65 percent nitric acid is added dropwise at room temperature to 1.15 g of 4-hydroxy-3-methoxyphenyl 3-pyridyl ketone dissolved in 15 ml of acetic acid. After stirring for 2 hours, the reaction mixture is poured into 120 ml of ice-water, whereupon the mixture is adjusted to pH 5 with conc. ammonia and the precipitate formed is filtered off. The thus-obtained residue is heated under reflux in 20 ml of acetonitrile, whereupon it is again filtered off. There is obtained 4-hydroxy-3-methoxy-5-nitrophenyl 3-pyridyl ketone as brown crystals of m.p. 193°.

1. customthe precipitate formed
2. filtrationis filtered off
3. temperatureThe thus-obtained residue is heated
4. temperatureunder reflux in 20 ml of acetonitrile, whereupon it
5. filtrationis again filtered off