[CH3:1][O:2][CH:3]([O:14][CH3:15])[CH2:4][S:5]([CH2:8][CH:9]([O:12][CH3:13])[O:10][CH3:11])(=O)=O.COCCCl>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.O>[CH3:1][O:2][CH:3]([O:14][CH3:15])[CH2:4][S:5][CH2:8][CH:9]([O:10][CH3:11])[O:12][CH3:13]In Example 13, involving synthesis of dimethoxyethyl sulfone (DMES), 50 ml 2-chloroethyl methyl ether, 70 g Na2S.9H2O, 17.6 g tetrabutylammonium bromide and 50 ml H2O were mixed into a three-neck flask equipped with magnetic stirrer and reflux condenser, and heated at 70° C. with vigorous stirring. The reaction was continued for overnight. The organic layer was separated and dissolved in chloroform, washed with distilled water several times to remove the ammonium salt and dried over anhydrous sodium sulfate. Solvent was removed using a rotary evaporator, and dimethoxyethyl sulfide was obtained with a yield of 63%. The sulfide was oxidized with H2O2 and acetic acid, as described in Example 1, to obtain the corresponding sulfone, dimethoxyethylsulfone (DMES).
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