Tosyl group

Tosyl group (blue) with a generic "R" group attached
Tosylate group with a generic "R" group attached. Note the extra oxygen, compared to plain tosyl.

In organic chemistry, a toluenesulfonyl group (tosyl group, abbreviated Ts or Tos[nb 1]) is a univalent functional group with the chemical formula −SO2−C6H4−CH3. It consists of a tolyl group, −C6H4−CH3, joined to a sulfonyl group, −SO2, with the open valence on sulfur. This group is usually derived from the compound tosyl chloride, CH3C6H4SO2Cl (abbreviated TsCl), which forms esters and amides of toluenesulfonic acid, CH3C6H4SO2OH (abbreviated TsOH). The para orientation illustrated (p-toluenesulfonyl) is most common, and by convention tosyl without a prefix refers to the p-toluenesulfonyl group.

The toluenesulfonate (or tosylate) group refers to the −O−SO2C6H4CH3 (–OTs) group, with an additional oxygen attached to sulfur and open valence on an oxygen.[1] In a chemical name, the term tosylate may either refer to the salts containing the anion of p-toluenesulfonic acid, TsOM+ (e.g., sodium p-toluenesulfonate), or it may refer to esters of p-toluenesulfonic acid, TsOR (R = organyl group).


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  1. ^ Smith, Michael B.; March, Jerry (2007). March's Advanced Organic Chemistry (6th ed.). John Wiley & Sons. p. 497. ISBN 978-0-471-72091-1.