Реакция #155757

Уравнение реакции

ethyl trifluoroacetate

n-BuLi

5-bromo-1,2,6-trichloro-benzene

→

2,2,2-trifluoro-1-(3,4,5-trichloro-phenyl)-ethanone

Растворители

diethyl ether

diethyl ether

Условия реакции

Обработка

1. 1
   workup.WAITAfter 40 minutes at −78° C.
2. 2
   Другоеquenched with a saturated aqueous solution of NH4Cl
3. 3
   ЭкстракцияThe aqueous phase is extracted three times with diethyl ether
4. 4
   СушкаThe combined organic phases are dried over Na2SO4
5. 5
   Концентрированиеconcentrated in vacuo
6. 6
   workup.DISTILLATIONThe crude product is purified by vacuum distillation

Методика

n-BuLi (16.5 ml, 2.5M in hexane) is added over 20 minutes to a solution of 5-bromo-1,2,6-trichloro-benzene (10.2 g) in diethyl ether (150 ml) under nitrogen at −78° C. After 20 minutes at −78° C., a solution of ethyl trifluoroacetate (5.15 ml) in diethyl ether (50 ml) is added over 15 minutes to the reaction mixture. After 40 minutes at −78° C., the reaction mixture is slowly warmed up to room temperature and then quenched with a saturated aqueous solution of NH4Cl. The aqueous phase is extracted three times with diethyl ether. The combined organic phases are dried over Na2SO4 and concentrated in vacuo. The crude product is purified by vacuum distillation to yield 2,2,2-trifluoro-1-(3,4,5-trichloro-phenyl)-ethanone (9.20 g) as a yellow solid.

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