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Trimethylsulfonium (systematically named trimethylsulfanium and trimethylsulfur(1+)) is an organic cation with the chemical formula (CH3)3S+ (also written as C
). It is the simplest sulfonium.

Several salts of trimethyl sulfonium are known:

Salt Molecular formula Chemical formula Molecular weight Properties
Trimethylsulfonium chloride (CH3)3SCl C3H9ClS 112.5 Crystals decompose at 100 °C, very soluble in ethanol, very hygroscopic.[1]
Trimethylsulfonium bromide (CH3)3SBr C3H9BrS 157 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 Crystals from ethanol, decomposes at 203-207 °C.[2][3]


  1. ^ Blattler, Monatsh., 1919, Volume 40 page 420.
  2. ^ a b Steinkopf, Muller (1923). Chemische Berichte 56: 1929.  Missing or empty |title= (help)
  3. ^ Mussgnug, Naturwiss.,year 1941, volume 29 page 256
  • All above entries obtained from Heilbron's Dictionary of Organic Compounds, volume 4, revised edition published in 1953. Published in Great Britain.

See also[edit]