反应详情

At −78° C., 182.4 ml of a 2.5 M butyllithium solution were added dropwise to a solution of 100 g of 4-benzyloxy-1-bromobenzene in 500 ml of dry tetrahydrofuran. Stirring was continued at −78° C. for 15 min, and 68.0 g of methyl trifluoroacetate were then added dropwise at this temperature. Stirring was subsequently continued at −20° C. for 2 hours. For work-up, 80 ml of saturated aqueous ammonium chloride were added dropwise, the mixture was mixed with 250 ml of dilute hydrochloric acid and diluted with 500 ml of toluene, and the organic phase was washed with water, dried and concentrated, to give the title product as a colourless oil which crystallised on digestion with heptane.

1. stirringStirring
2. waitwas subsequently continued at −20° C. for 2 hours
3. washthe organic phase was washed with water
4. customdried
5. concentrationconcentrated