[OH-].[K+].[Br:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[OH:10].[CH2:11]([O:13][CH:14]([O:17][CH2:18][CH3:19])[CH2:15]Br)[CH3:12]>O.CS(C)=O.CCOCC>[CH2:11]([O:13][CH:14]([O:17][CH2:18][CH3:19])[CH2:15][O:10][C:5]1[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=1[Br:3])[CH3:12]A solution of KOH pellets (85%, 0.68 g, 10.3 mmol) in water (1.5 mL) was added to 2-bromophenol (1 mL, 8.6 mmol). The mixture was diluted with DMSO (20 mL) and bromoacetaldehyde diethyl acetal (1.43 mL, 9.5 mmol) was added. The mixture was heated at 100° C. for 6 h, cooled to rt, diluted with ether (175 mL), washed with water (3×40 mL) and 5% aq NaOH (40 mL), and dried over MgSO4. Removal of the solvent left 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, quant) as an oil.
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