Br[C:2]([F:11])([F:10])[C:3](Cl)([F:8])[CH2:4][C:5]([OH:7])=[O:6]>[Zn]>[F:8][C:3](=[C:2]([F:11])[F:10])[CH2:4][C:5]([OH:7])=[O:6]Dehalogenation of 4-bromo-3-chloro-3,4,4-trifluorobutanoic acid (VIII) with zinc using conditions analogous to those disclosed in the literature to obtain the desired 3,4,4-trifluoro-3-butenoic acid (IV); or
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