反应详情

Into a suspension of [5-bromo-2-[2-(4-methylphenyl)-2-oxoethoxy]benzyl](triphenyl)phosphonium bromide (5.53 g) in ethanol (20 ml) was added at room temperature a 20% solution of sodium ethoxide in ethanol (2.85 g), and the resulting mixture was stirred for 24 hours. After addition of water (15 ml) to the reaction mixture, a solid material was collected by filtration and was washed with water. The solid material were purified by recrystallization (ethanol) to obtain 6-bromo-3-(4-methylphenyl)-2H-1-benzopyran (2.16 g) as colorless crystals.

1. filtrationa solid material was collected by filtration
2. washwas washed with water
3. customThe solid material were purified by recrystallization (ethanol)