[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2([C:11]#N)[CH2:10][CH2:9]2)=[CH:4][C:3]=1[F:13].[OH-:14].[Na+].[OH:16]O.Cl>CO>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2([C:11]([OH:16])=[O:14])[CH2:10][CH2:9]2)=[CH:4][C:3]=1[F:13]A suspension of 4-bromo-3-fluorophenylcyclopropanenitrile (21 mmoles) in methanol (10 ml) is added with a 35% NaOH aqueous solution (40 ml) and a 35% H2O2 aqueous solution (3 ml), then is refluxed for 4 hours, cooled at room temperature and added with 2N HCl (250 ml). The precipitated solid is collected by filtration and redissolved in a 5% NaHCO3 aqueous solution (300 ml). The insoluble fraction is filtered off and the clear filtrate is acidified to pH=2 with 2N HCl. The product precipitates as a white solid, which is recovered by filtration and dried under vacuum.
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