反应详情

To a stirred solution of n-butyllithium (4 mL, 2,5 M solution in hexane, 10 mmol) (Aldrich) in ether (30 mL) was added methyltriphenylphosphonium bromide (3.57 g, 10 mmol) (Aldrich) over a period of 5 min. The reaction mixture was stirred for 4 h at room temperature. To the resulting orange solution was added methyl 4-formylbenzoate (1.54 mL, 10 mmol) dropwise. The solution became colorless, and a white precipitate separated. The mixture was then heated to reflux and immediately allowed to cool to room temperature. The precipitate was removed by filtration. The resulting precipitate was washed with ether, and the combined ethereal filtrates were washed with water until neutral and then dried over anhydrous MgSO4. The solvent was removed and the residue, 4-ethenyl-benzoic acid methyl ester, was used in the next reaction without further purification.

1. customa white precipitate separated
2. temperatureThe mixture was then heated
3. temperatureto reflux
4. temperatureto cool to room temperature
5. customThe precipitate was removed by filtration
6. washThe resulting precipitate was washed with ether
7. washthe combined ethereal filtrates were washed with water until neutral and
8. dry with materialthen dried over anhydrous MgSO4
9. customThe solvent was removed
10. customthe residue, 4-ethenyl-benzoic acid methyl ester, was used in the next reaction without further purification