The formation and chemical behaviors of trifluoromethylated allylzinc and allenylzinc reagents
derived from the umpolung of allyl- or allenylpalladium complexes have been described. The
reactions of these reagents with aldehydes proceeded smoothly to afford highly stereocontrolled
γ-(trifluoromethyl)-δ-hydroxy α,β-unsaturated materials. Their configurations determined by the
spectral data were anti, and Z-isomers were produced from the system of allylzinc reagents.
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