C(O[CH:4]=[C:5]([C:11](=[O:22])[C:12]1[CH:17]=[C:16]([F:18])[C:15]([F:19])=[C:14]([F:20])[C:13]=1[F:21])[C:6]([O:8][CH2:9][CH3:10])=[O:7])C.[NH3:23]>CCO>[NH2:23][CH:4]=[C:5]([C:11](=[O:22])[C:12]1[CH:17]=[C:16]([F:18])[C:15]([F:19])=[C:14]([F:20])[C:13]=1[F:21])[C:6]([O:8][CH2:9][CH3:10])=[O:7]12.8 g of ethyl 3-ethoxy-2-(2,3,4,5-tetrafluoro-benzoyl)-acrylate are initially introduced into 16 ml of EtOH. A mixture of 3.3 ml of concentrated aqueous NH3 solution and 10 ml of EtOH is added dropwise with ice cooling. The mixture is subsequentially stirred for 2 hours. Ice-water is then added, and the precipitated solid is filtered off under suction.
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