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y-position with various nucleophiles (alkoxides, phenoxide, thiolates and cyanide) gave rise to substituted electrophilic cyclopropanes or ring-opening products, depending upon the reaction conditions, the nature of the nucleophiles and the activating groups and the substitution pattern of the allyl halides. A kinetic study revealed that the reaction involved a nucleophilic addition as the rate determining step followed by a fast ringclosure.Reactions of allylic halides bearing two electron-withdrawing groups in i 43

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