[Br:1][C:2]1[CH:3]=[CH:4][C:5]([O:10][CH2:11][CH:12]2[CH2:14][O:13]2)=[C:6]([CH:9]=1)C=O.C1C=C(Cl)C=C([C:22]([O:24]O)=[O:23])C=1.C(=O)(O)[O-].[Na+]>C(Cl)Cl>[CH:22]([O:24][C:6]1[CH:9]=[C:2]([Br:1])[CH:3]=[CH:4][C:5]=1[O:10][CH2:11][CH:12]1[CH2:14][O:13]1)=[O:23]To a solution of 5-bromo-2-(oxiran-2-ylmethoxy)benzaldehyde (12.3 g, 47.7 mmol) in DCM (50 ml) was added m-CPBA (12.8 g, 57.2 mmol). The solution was heated at reflux for 3 h and 30 min and then brought to ambient temperature. Aqueous sodium bicarbonate (saturated) and DCM was added and the phases were separated. The organic phase was washed with brine, dried (Na2SO4), filtered and evaporated to dryness to give the crude title compound. Crude yield: 12.3 g. MS m/z (rel. intensity, 70 eV) 272 (M+, 7), 244 (50), 189 (95), 188 (bp), 57 (93).
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