Diethyl Ether → 3,3-Diphenylpropene

Participants

Reaction Steps

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 <ALOKE, Temp.>° 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%).

Provenance & Evidence