反应详情

Triphenyl phosphine (13 g.) was dissolved in dry benzene (60 ml.) and ethyl bromoacetate (8.3 g.) was added dropwise. The solution was heated at 70° for 2 days, and then cooled and filtered. The residue was washed with benzene and dried to give about 16 g. of (ethoxycarbonylmethyl) triphenylphosphonium bromide. The phosphonium salt (10 g.) was dissolved in water (250 ml.) and 5% aqueous sodium hydroxide was added dropwise with stirring until the solution became alkaline to litmus. The resulting precipitate was filtered off, washed with water and dried. Crystallisation from ethyl acetate/petroleum spirit gave (ethoxycarbonyl methylene) triphenyl phosphorane as a colourless solid in about 80% yield.

1. temperatureThe solution was heated at 70° for 2 days
2. temperaturecooled
3. filtrationfiltered
4. washThe residue was washed with benzene
5. customdried
6. customto give about 16 g
7. filtrationThe resulting precipitate was filtered off
8. washwashed with water
9. customdried
10. customCrystallisation from ethyl acetate/petroleum spirit