[NH3:1].O=[C:3]([C:11]([F:14])([F:13])[F:12])[CH:4]([F:10])[C:5]([O:7][CH2:8][CH3:9])=[O:6].O>C1(C)C=CC=CC=1>[NH2:1]/[C:3](/[C:11]([F:14])([F:13])[F:12])=[C:4](/[F:10])\[C:5]([O:7][CH2:8][CH3:9])=[O:6]Ammonia is introduced with stirring into a solution of 7.5 g of ethyl 3-oxo-2,4,4,4-tetrafluorobutyrate in 20 ml of toluene at 75° C. up to saturation. Then the reaction mixture is heated using a water separator for 5 hours, during which ethyl 3-amino-2,4,4,4-tetrafluorocrotonate is formed as an intermediate.
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