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Structural formula of the fluorosulfonate group
PubChem 3413884 YesY
ChemSpider 2657785 YesY
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Fluorosulfonate, in organic chemistry, is a functional group that has the chemical formula F-SO2-O-R, and typically is a very good leaving group. In inorganic chemistry, fluorosulfonate is the anion F-SO2-O-, the conjugated base of fluorosulfonic acid.

Organic (alkyl) fluorosulfonates are usually strong alkylation agents, similar to triflate esters (F3C-SO2-OR). But unlike the triflate group, the fluorosulfonate group is not stable against hydrolysis. Therefore, fluorosulfonate esters are less frequently used as alkylation agents than triflate esters.

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