Methyl fluorosulfonate

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| Watchedfields = changed

| verifiedrevid = 401527957

| ImageFile_Ref = {{chemboximage|correct|??}}

| ImageFile = Methyl fluorosulfonate.png

| ImageSize = 150px

| ImageFile1 = Methyl-fluorosulfonate-3D-balls.png

| PIN = Methyl sulfurofluoridate

| OtherNames = {{bulleted list|Methyl fluorosulphonate|Fluorosulfonic acid, methyl ester|Methyl fluorosulphate|Magic methyl}}

|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 9486

| InChI = 1/CH3FO3S/c1-5-6(2,3)4/h1H3

| InChIKey = MBXNQZHITVCSLJ-UHFFFAOYAW

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/CH3FO3S/c1-5-6(2,3)4/h1H3

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = MBXNQZHITVCSLJ-UHFFFAOYSA-N

| CASNo_Ref = {{cascite|correct|??}}

| CASNo = 421-20-5

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = N015VFJ94Z

| PubChem = 9870

| SMILES = FS(=O)(=O)OC

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|Section2={{Chembox Properties

| C=1|H=3|F=1|O=3|S=1

| Appearance =

| Density = 1.45 g/mL

| MeltingPt =

| BoilingPtC = 93

| Solubility =

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|Section3={{Chembox Hazards

| MainHazards =

| FlashPt =

| AutoignitionPt =

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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 Because of several fatal accidents involving this compound, it has largely been replaced by the related reagent methyl trifluoromethanesulfonate.