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温度

0 °C

Methyltriphenylphosphonium bromide (4 g, 11.12 mmol) was added over a 15-min period to a mixture of butyllithium (7.3 ml of 1.6 M solution in THF, 11.76 mmol) and dry THF (50 ml) with stirring and under nitrogen atmosphere at 0° C. The reaction mixture was stirred for 2 h at room temperature and the mixture was then recooled to −78° C. A solution of diphenylacetaldehyde (2.2 g, 11.12 mmol) in dry THF (10 ml) was added to the above mixture over a 15-min period. The reaction mixture was stirred for 24 h at room temperature, followed by addition of ethyl ether (200 ml), and the reaction mixture was then filtered. The ether extracts were washed with water (3×50 ml), brine (100 ml) and dried over anhydrous sodium sulfate. The crude material was purified by flash chromatography on silical gel (Hexane:Ethyl ether=9:1) to give pure 3,3-diphenylpropene 460 mg (46%).

1. stirringThe reaction mixture was stirred for 2 h at room temperature
2. customwas then recooled to −78° C
3. stirringThe reaction mixture was stirred for 24 h at room temperature
4. filtrationthe reaction mixture was then filtered
5. washThe ether extracts were washed with water (3×50 ml), brine (100 ml)
6. dry with materialdried over anhydrous sodium sulfate
7. customThe crude material was purified by flash chromatography on silical gel (Hexane:Ethyl ether=9:1)