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Synthesis of trimethysulfonium hydrogen sulfate: To dimethyl sulfate (10.0 mL, 1.05×10−1 mol) at 0° C. was added dimethyl sulfide (10.4 mL, 1.42×10−1 mol). After rapidly stirring at 0 C for 30 minutes, the reaction was slowly warmed to room temperature yielding a crystalline solid, trimethylsulfonium methyl sulfate. After 3 hours, distilled water (20 mL) was added to form a clear solution of trimethylsulfonium sulfate.