Hydrogen Peroxide → Sulfonium, trimethyl-, sulfate (1:1)

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Reaction Steps

Trimethylsulphonium iodide (9.8 g, 0.048 moles) was dissolved in water (50 ml). Sulphuric acid (4.8 g at 98%, 0.048 moles) and hydrogen peroxide (2.72 g at 30%. 0.024 moles) were each diluted to 10 ml with water and added to the stirred trimethylsulphonium iodide solution. Carbon tetrachloride (150 ml) was added to extract the iodine that was produced and the mixture was stirred for 6 hours. The layers were separated. To the aqueous layer was added carbon tetrachloride (150 ml) and this was stirred overnight. The layers were separated and the aqueous layer was extracted with aliquots of carbon tetrachloride (20 ml) until no further pink colouration was visible. Palladium on carbon (3%, 0.25 g) was added to the aqueous solution to destroy any unreacted peroxide. The solution was filtered after 60 minutes, and washed with ether (2×20 ml). The water was removed under reduced pressure to produce an oily residue which was dried under vacuum at 78° C. The oil was dissolved in hot ethanol and cooled in an acetone/solid carbon dioxide bath to produce a white solid. The solid was filtered off, maintaining the temperature below 0° C. and dried under reduced pressure at 78° C. to yield a very deliquescent residue (2.7 g, 32% yield of theory). This material was dissolved in hot ethanol and allowed to cool slowly in an acetone/solid carbon dioxide bath to produce a waxy solid. The solid was filtered off, maintaining the temperature below 0° C. and dried under reduced pressure at 80° C. to yield a very deliquescent residue, melting point 20°-21° C. C3H10S2O4 (174.2): calculated C. 20.7, H 5.8, S 36.8; found C 20.7, H 5.9, S 36.6. 1H NMR (DMSO-d6 /TMS): δ2.91 (s, 9H, CH3 -S); 7.4-7.6(s, 1H, HSO4). pH=1.8-1.9 (HSO4-).

Provenance & Evidence