[Cl-].[CH2:2]([N+:4]1([CH2:9][O:10][CH3:11])[CH2:8][CH2:7][CH2:6][CH2:5]1)[CH3:3].[F:12][As-:13]([F:18])([F:17])([F:16])([F:15])[F:14].[Li+].C(Cl)(Cl)Cl>O>[F:12][As-:13]([F:18])([F:17])([F:16])([F:15])[F:14].[CH2:2]([N+:4]1([CH2:9][O:10][CH3:11])[CH2:8][CH2:7][CH2:6][CH2:5]1)[CH3:3]In 40.0 g of water was dissolved 13.12 g of N-ethyl-N-methoxymethylpyrrolidinium chloride and thereto was added 14.30 g of lithium hexafluoroarsenate (reagent, Wako Pure Chemical Ind. Ltd.). The mixture was reacted at room temperature for 1 hour, and 30.00 g of chloroform was added to the mixture for extraction. The extract was washed with 15.0 g of water 15 times, and thereafter dried, giving 11.50 g of the desired product in the form of a white solid. The product was checked for 1H-NMR as in Example 1.
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