75 part by weight of methyl chloride gas was added the reaction was additionally continued for one day after which the pressure was released the crystals that had formed within the system were separated off by vacuum filtration and then dried using a vacuum pump thereby giving 1 29 parts by weight of n 2 methoxyethyl n methylpyrrolidinium chloride yield 92 the cation exchange resin amberlist 15js hg dry organo corporation was packed into an approximately 20 ml column and exchanged to the hydrogen form an aqueous solution of 55 g of n 2 methoxyethyl n methylpyrrolidinium chloride mempcl dissolved in 100 ml of deionized water was passed through the packed column after which deionized water was thoroughly passed through the column until the eluate reached neutrality after carrying out this and similar operations a plurality of times the eluate obtained when n 2 methoxyethyl n methylpyrrolidinium chloride had been passed through was confirmed to be substantially neutral indicating that the resin had been converted to the n 2 methoxyethyl n methylpyrrodinium form following such conversion deionized water was thoroughly passed through the column and the eluate was confirmed to be neutral an aqueous solution of 7 57 g of sodium 3 trimethylsilyl 1 propanesulfonate from sigma aldrich co dissolved in 150 ml of deionized water was then passed.