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Illustration of cage extractant recycling: (i) After evaporation of CD3NO2, ReO4 −⊂1⋅[BArF]11 was redissolved in degassed EtOAc; degassed H2O was then added. (ii) After stirring for 4 h, the cage disassembled and ReO4 − was released, transferring to the H2O phase. (iii) After separation and evaporation of the EtOAc layer, addition of CD3CN and nBuBF3 − resulted in regeneration of the extractant nBuBF3 −⊂1⋅[BArF]11.
