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SULFONIUM - 2 reference results
Sulfonium
A sulfonium ion, also known as sulphonium ion and sulfanium ion, is a positively charged sulfur ion carrying three alkyl groups as substituents (S+R3). Ionic compounds consisting of a positively charged sulfonium cation and a negatively charged anion are called sulfonium salts.

Sulfonium compounds can be synthesized from the reaction of dialkylsulfides with alkyl halides:

CH3-S-CH3 + CH3-I → (CH3)3S+ I− (trimethylsulfonium iodide)

In the above reaction, the alkylation of a sulfide, the sulfur atom has two lone electron pairs. Using those lone pairs, the sulfide acts as a nucleophile, and attacks the carbon of iodomethane. At the same time, as part of a concerted nucleophilic substitution mechanism (SN2), the iodide leaving group comes off; this leaves a positively charged trimethylsulfonium ion. This cation is attracted to the negatively charged iodide, so the two form an ionic bond, giving trimethylsulfonium iodide.

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Last updated on Thursday October 09, 2008 at 07:13:49 PDT (GMT -0700)
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Japanese Inventors Develop Sulfonium Salt Compound
Jul 10, 2008; ALEXANDRIA, Va., July 10 -- Takashi Miyamatsu, Hirokazu Niwata, Satoshi Ebata and Yong Wang, all from Tokyo, have developed a...
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Synthesis of zwitterionic selenonium and sulfonium sulfates from D-mannose as potential glycosidase inhibitors (1).
Apr 01, 2006; Introduction The controlled inhibition of glycosidase enzymes plays important roles in the biochemical processing of biopolymers...
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sulfonium
Jan 01, 1988; Webster's NewWorld Dictionary 01-01-1988 sul|fo|ni|um (sul fo'ne m) n. a monovalent radical containing three alkyl radicals and...
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Design and synthesis of selenonium and sulfonium ions related to the naturally occurring glucosidase inhibitor salacinol (1).
Oct 01, 2006; Abstract: Four series of analogues of the naturally occurring glucosidase inhibitor salacinol were synthesized for...
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Research from Western Washington University in the area of ocean research described.
Mar 13, 2009; Many groups of tropical cnidarians including scleractinian corals, octocorals, corallimorphs, and anemones contain the tertiary...
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