反应详情

A mixture of 4.94 g. (0.015 mol.) of carbon tetrabromide, 3.90 g. (0.015 mol.) of triphenylphosphine and 0.975 g. (0.015 g.-atom) of zinc in 25 ml. of carbon tetrachloride is stirred at 25° for 24 hours. A solution of 1.0 g. (7.45 mmol.) of p-ethylbenzaldehyde in 10 ml. of methylene chloride is added and the reaction mixture is stirred an additional 2 hours. Petroleum ether (140 ml.) is added to the mixture, the organic layer is decanted and the residue is extracted with 1:4 methylene chloride-petroleum ether. The combined organic solutions are concentrated under reduced pressure to give 1,1-dibromo-2-(4-ethylphenyl)ethylene.

1. additionA mixture of 4.94 g
2. customthe organic layer is decanted
3. extractionthe residue is extracted with 1:4 methylene chloride-petroleum ether
4. concentrationThe combined organic solutions are concentrated under reduced pressure