[Cl-].[CH3:2][O:3][CH2:4][N+:5]1([CH3:10])[CH2:9][CH2:8][CH2:7][CH2:6]1.[F:11][As-:12]([F:17])([F:16])([F:15])([F:14])[F:13].[Li+].ClCCl>O>[F:11][As-:12]([F:17])([F:16])([F:15])([F:14])[F:13].[CH3:2][O:3][CH2:4][N+:5]1([CH3:10])[CH2:9][CH2:8][CH2:7][CH2:6]1In 50.0 g of water was dissolved 25.1 g of N-methoxymethyl-N-methylpyrrolidinium chloride and thereto was added 30.0 g of lithium hexafluoroarsenate (reagent, Aldrich Corp.). The mixture was reacted at room temperature for 1 hour, and 79.2 g of dichloromethane was added to the mixture for extraction. The extract was washed with 100 ml of water 15 times, thereafter concentrated and dried in a vacuum, giving 32.4 g of the desired product in the form of a white solid.
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