Methyl fluorosulfonate

Methyl fluorosulfonate

Names
IUPAC name Methyl fluorosulfonate
Other names Methyl fluorosulphonate; fluorosulfonic acid; methyl ester; methyl fluorosulphate; magic methyl
Identifiers
CAS Number	421-20-5 Y
3D model (JSmol)	Interactive image
ChemSpider	9486 Y
ECHA InfoCard	100.006.369
PubChem CID	9870
InChI InChI=1S/CH3FO3S/c1-5-6(2,3)4/h1H3 Y Key: MBXNQZHITVCSLJ-UHFFFAOYSA-N Y InChI=1/CH3FO3S/c1-5-6(2,3)4/h1H3 Key: MBXNQZHITVCSLJ-UHFFFAOYAW
SMILES FS(=O)(=O)OC
Properties
Chemical formula	CH3O3FS
Molar mass	114.09 g/mol
Density	1.45 g/mL
Boiling point	93 °C (199 °F; 366 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

Methyl fluorosulfonate, (also known as magic methyl), is the organic compound with the formula FSO₂OCH₃. It is a colorless liquid that is used as a strong methylating agent in organic synthesis. Because of its extreme toxicity, it has largely been replaced by the related reagent methyl trifluoromethanesulfonate.

It is prepared by distillation of an equimolar mixture of fluorosulfonic acid and dimethyl sulfate. It was originally produced by the reaction of methanol with fluorosulfonic acid.

Methyl fluorosulfonate is a highly electrophilic reagent for methylation. It is ranked as less powerful than methyl trifluoromethanesulfonate.

It is acutely toxic with LC₅₀ (rat) ~ 5 ppm.