You must pass a solution of KF through the resin in Cl fgorm and then wash thoroughly with wáter or a solvent until no reaction to Cl or F-

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F- Amberlyst® A-26 resin was prepared by the method described in Reactive Polymers 23. 101 (1994) with some slight modifcations. As received chloride form of Amberlyst® A-26. 102 g. was placed in a 250 mL Nalgene Buchner funnel. The resin was washed repeatedly with 1M NaOH (total volume about 10 L) until the washings were nearly Cl- free as judged by testing with HNO3/AgNO3. The resin was then washed with deionized water until the washing were neutral with 1M HF (~1 L) until acidic. and with water again until neutral. Following washing with 800 mL acetone and then 250 mL ether. the resin was dried at room temperature under vacuum overnight.