Geminal regioselectivity electron-withdrawing groups

Induced geminal regioselectivity from an electron-withdrawing group... 

Treatment of a vinylcyclopropane substituted with two geminal electron-withdrawing groups on the three-membered ring with catalytic amounts of a palladium(O) complex gives a zwitte-rionic 7r-allyl complex, which reacts regioselectively but not stereoselectively to form a vinyl-cyclopen tene 5 13. This method represents a mild alternative to the thermal vinylcyclopropane rearrangement. 

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