High Quality Content by WIKIPEDIA articles! A sulfonium ion, also known as sulphonium ion and sulfanium ion, is a positively charged ion (a "cation") featuring three organic substituents attached to sulfur. They have the formula Together with their negatively charged counterpart, the anion, the compounds are called sulfonium salts.The compounds are pyramidal at sulfur. Thus Me3S+ is structurally similar to the isoelectronic compound trimethylphosphine. Sulfonium compounds wherein the three substituents differ are chiral and optically stable.

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