Trimethylsulfonium (systematically named trimethylsulfanium) is an organic cation with the chemical formula (also written as ).
Trimethylsulfonium (systematically named trimethylsulfanium) is an organic cation with the chemical formula (also written as ).
==Compounds== thumb|left|upright=1.1|Structure of in its tetraphenylborate salt. Several salts of trimethylsulfonium are known. X-ray crystallography reveals that the ion has trigonal pyramidal molecular geometry at sulfur atom, with C-S-C angles near 102° and C-S bond distance of 177 picometers. Unless the counteranion is colored, all trimethylsulfonium salts are white or colorless.
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