Trimethylsulfonium
Trimethylsulfonium (systematically named trimethylsulfanium and trimethylsulfur(1+)) is an organic cation with the chemical formula (CH3)3S+ (also written as C
3H
9S+
). It is the simplest sulfonium and several salts of trimethylsulfonium are known:
| Salt | Molecular formula | Chemical formula | Molecular weight | Properties |
|---|---|---|---|---|
| Trimethylsulfonium chloride | (CH3)3SCl | C3H9ClS | 112.5 | Colorless crystals, decompose at 100 °C, very soluble in ethanol, very hygroscopic.[1] |
| Trimethylsulfonium bromide | (CH3)3SBr | C3H9BrS | 157 | Colorless crystals from H2O. Decomposes at 172 °C, melts in a sealed tube at 201-201 °C, reacts in neutral aqueous solution.[2] |
| Trimethylsulfonium iodide | (CH3)3SI | C3H9IS | 204 | Colorless crystals from ethanol, decomposes at 203-207 °C.[2][3] |
Sulfonium compounds can be synthesised by treating a suitable alkyl halide with a thioether. For example, the reaction of dimethyl sulfide with iodomethane yields trimethylsulfonium iodide:
- CH3-S-CH3 + CH3-I → (CH3)3SI
References
- ↑ Blättler, H. (1919). "Über Trimethylsulfoniumverbindungen". Monatshefte für Chemie und verwandte Teile anderer Wissenschaften 40 (8): 417–429. doi:10.1007/BF01559085.
- 1 2 Steinkopf, W.; Müller, S. (1923). "Über die Einwirkung von Jodmethyl auf Disulfide". Chem. Ber. 56 (8): 1926–1930. doi:10.1002/cber.19230560834.
- ↑ Mussgnug, F. (1941). "Trimethylammoniumjodid und Trimethylsulfoniumjodid". Naturwissenschaften 29 (17): 256. doi:10.1007/BF01479158.
- All above entries obtained from Heilbron's Dictionary of Organic Compounds, volume 4, revised edition published in 1953. Published in Great Britain.
See also
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