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Palladium-catalyzed coupling of trifluorovinylzinc reagent with substituted aryl halides Y-C<sub>6</sub>H<sub>4</sub>-X (Y=p-NO<sub>2</sub>, p-and m-COOMe, p-COOH, p-CONH<sub>2</sub>, p- and m-CN; X=Br, I, C