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Under our optimized condition, solutions of the ketene and the nucleophile are added dropwise via a syringe pump to a solution of the catalyst and NFSI; Selectfluor reagent is not a suitable substitute for NFSI; the ee of the product is constant during the course of the reaction; an o -tolyl-substituted and a tert -butyl-substituted ketene were not effective reaction partners.
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Under our optimized condition, solutions of the ketene and the nucleophile are added dropwise via a syringe pump to a solution of the catalyst and NFSI; Selectfluor reagent is not a suitable substitute for NFSI; the ee of the product is constant during the course of the reaction; an o -tolyl-substituted and a tert -butyl-substituted ketene were not effective reaction partners.
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