[H-].[Na+].[Br:3][C:4]1[CH:9]=[CH:8][C:7]([OH:10])=[C:6]([C:11]([F:14])([F:13])[F:12])[CH:5]=1.Cl[CH2:16][O:17][CH2:18][CH2:19][O:20][CH3:21]>C1COCC1>[Br:3][C:4]1[CH:9]=[CH:8][C:7]([O:10][CH2:16][O:17][CH2:18][CH2:19][O:20][CH3:21])=[C:6]([C:11]([F:12])([F:13])[F:14])[CH:5]=1Sodium hydride (60% w/w dispersion in mineral oil, 0.96 g) was added to a solution of 4-bromo-2-trifluoromethyl-phenol (5.0 g) in dry THF (200 ml) and the mixture was stirred for 30 minutes. 1-Chloromethoxy-2-methoxy-ethane (2.85 ml) was then added and the mixture was stirred for 1 hour at room temperature. The solvent was removed under reduced pressure. The residue was taken into water and tert-butyl methyl ether, the organic layer was washed with brine, dried over sodium sulphate and concentrated under reduced pressure to afford 4-bromo-1-(2-methoxy-ethoxymethoxy)-2-trifluoromethyl-benzene (6.4 g) as an oil.
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