A sulfonium ion, also known as sulphonium ion or sulfanium ion, is a positively charged ion (a `cation`) featuring three organic substituents attached to sulfur. They have the formula [SR3]+. Together with their negatively charged counterpart, the anion, the compounds are called sulfonium salts. ==Synthesis== Sulfonium compounds are usually be s.....
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http://en.wikipedia.org/wiki/Sulfonium
the positively charged group HS⫀, its salts, or their substitute products.
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https://www.infoplease.com/dictionary/sulfonium
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