Carbon tetrabromide → 1-(Benzyloxy)-3-(2,2-dibromoethenyl)benzene

Beteiligte Stoffe

Reaktionsschritte

To a solution of triphenylphosphine (119.6 g) in methylene chloride (420 mL) at 0° C. was added a solution of carbon tetrabromide (75.72 g) in methylene chloride (90 mL). After completion of the addition, the mixture was stirred for 10 min. Then a solution of 3-(benzyloxy)benzaldehyde (J.A.C.S., 99, 2571 (1977)) (40 g) in methylene chloride (150 ml) was added. The mixture was stirred for 16 hrs at -5° C. After warming to room temperature, the organic layer was washed with saturated sodium bicarbonate (2×150 ml) and brine (1×150 ml), then dried over magnesium sulfate, filtered and the mixture was concentrated. Ether (300 ml) was added, causing the formation of a precipitate which was filtered. The filtrate was concentrated and the process repeated 2 times. Finally, the filtrate was concentrated and chromatographed using 10% ethyl acetate in hexane, affording the title compound as a solid.

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