Copper-Catalyzed Regioselective Synthesis of (<i>E</i>)-β-Fluorovinyl Sulfones.

We observed a clear trend between the electronic properties of the substrate and the E : Z selectivity; substrates featuring more electron-rich aromatic rings favored the formation of the desired E isomers, whereas the opposite was true for substrates featuring more electron-poor aromatic rings ( Figure 1 ).

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