sulphoniumsulfoniumn.
Chem.
A hypothetical monovalent complex cation having a central sulphur atom bonded to three hydrogen atoms; also, any derivative of this in which one or more of the hydrogen atoms is replaced by organic radicals. Usu. attrib.
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carboxylate1884
sulphonium1894
oxonium1899
hexamethonium1949
lipoate1954
tropylium1954
1894 Jrnl. Chem. Soc. 66 i. 243 Phenyl, which does not form ammonium and sulphonium bases, forms iodonium bases.
1942 Jrnl. Amer. Chem. Soc. 64 1165/1 The ability of dialkyl sulfides to react with ω-halogenated ketones with the subsequent formation of sulfonium halides has been known for some time.
1975 R. F. Brown Org. Chem. xxix. 945 The sulfonium ions (R3S+) are much more stable than are the analogous oxonium ions (R3O+).
This entry has not yet been fully updated (first published 1933; most recently modified version published online November 2010).
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