Trifluoromethanesulfonic anhydride

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Names
Preferred IUPAC name

Trifluoromethanesulfonic anhydride

Identifiers

CAS Number

* 358-23-6 Y

3D model (JSmol)

* Interactive image

Beilstein Reference

| 1813600
ChEBI |

* CHEBI:48509

ChemSpider |

* 61068

EC Number |

* 206-616-8

PubChem CID

* 67749

UNII |

* 8W034LHG1U Y

InChI

* InChI=1S/C2F6O5S2/c3-1(4,5)14(9,10)13-15(11,12)2(6,7)8

Key: WJKHJLXJJJATHN-UHFFFAOYSA-N

SMILES

* C(F)(F)(F)S(=O)(=O)OS(=O)(=O)C(F)(F)F

Properties

Chemical formula

| C2F6O5S2
Molar mass | 282.13 g·mol−1
Appearance  | colourless liquid
Density | 1.6770 g/mL
Boiling point |  82[1] °C (180 °F; 355 K)

Solubility in water

| Reacts to form triflic acid
Hazards
Safety data sheet | Fisher MSDS
GHS pictograms |
GHS Signal word | Danger

GHS hazard statements

| H272, H302, H314, H335
NFPA 704 (fire diamond)  |

~~W~~

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

N verify (what is YN ?)
Infobox references

Tracking categories (test):

* PairSizeSet

Trifluoromethanesulfonic anhydride, also known as triflic anhydride, is the chemical compound with the formula (CF3SO2)2O. It is the acid anhydride derived from triflic acid. This compound is a strong electrophile, useful for introducing the triflyl group, CF3SO2. Abbreviated Tf2O, triflic anhydride is the acid anhydride of the superacid triflic acid, CF3SO2OH.[2][3]

## Contents

* 1 Preparation and uses
* 2 Assay
* 3 Safety
* 4 See also
* 5 References

## Preparation and uses

Triflic anhydride is prepared by dehydration of triflic acid using P4O10.[2][4]

Triflic anhydride is useful for converting ketones into enol triflates.[5]

In a representative application, is used to convert an imine into a NTf group.[6] It will convert phenols into a triflic ester, which enables cleavage of the C-O bond.[7][8]

## Assay

The typical impurity in triflic anhydride is triflic acid, which is also a colorless liquid. Samples of triflic anhydride can be assayed by 19F NMR spectroscopy: −72.6 ppm[9] vs. −77.3 for TfOH (std CFCl3).

## Safety

It is an aggressive electrophile and readily hydrolyzes to the strong acid triflic acid. It is very harmful to skin and eyes.[10]

## See also

* Methanesulfonic anhydride

## References

1. ↑ Bloodworth, A.J.; Curtis, Richard J.; Spencer, Michael D.; Tallant, Neil A. (March 1993). "Oxymetallation. Part 24. Preparation of cyclic peroxides by cycloperoxymercuriation of unsaturated hydroperoxides.". Tetrahedron 49 (13): 2729–2750. doi:10.1016/S0040-4020(01)86350-X.
2. ↑ 2.0 2.1 Martínez, A. G.; Subramanian, L. R.; Hanack, M. (2016). "Trifluoromethanesulfonic Anhydride". Encyclopedia of Reagents for Organic Synthesis. pp. 1–17. doi:10.1002/047084289X.rt247.pub3. ISBN 9780470842898.
3. ↑ Baraznenok, Ivan L.; Nenajdenko, Valentine G.; Balenkova, Elizabeth S. (May 2000). "Chemical Transformations Induced by Triflic Anhydride". Tetrahedron 56 (20): 3077–3119. doi:10.1016/S0040-4020(00)00093-4.
4. ↑ Peter J. Stang, Thomas E. Dueber (1974). "Preparation of Vinyl Trifluoromethanesulfonates: 3-Methyl-2-Buten-2-Yl Triflate". Organic Syntheses 54: 79. doi:10.15227/orgsyn.054.0079.
5. ↑ Cacchi, Sandro; Morera, Enrico; Ortar, Giorgio (2011). "Discussion Addendum for: Palladium-Catalyzed Reduction of Vinyl Trifluoromethanesulfonates to Alkenes: Cholesta-3,5-diene". Organic Syntheses 88: 260. doi:10.15227/orgsyn.088.0260.
6. ↑ Baker, T. J.; Tomioka, M.; Goodman, M. (2002). "Preparation and Use of N,N'-Di-BOC-N''-Triflylguanidine". Organic Syntheses 78: 91. doi:10.15227/orgsyn.078.0091.
7. ↑ McWilliams, J. C.; Fleitz, F. J.; Zheng, N.; Armstrong, III, J. D.. "Preparation of n-Butyl 4-Chlorophenyl Sulfide". Organic Syntheses 79: 43. doi:10.15227/orgsyn.079.0043.
8. ↑ Cai, D.; Payack, J. F.; Bender, D. R.; Hughes, D. L.; Verhoeven, T. R.; Reider, P. J. (1999). "(R)-(+)- and (S)-(−)-2,2'-Bis(Diphenylphosphino)-1,1'-Binaphthyl (BINAP)". Organic Syntheses 76: 6. doi:10.15227/orgsyn.076.0006.
9. ↑ Dell'Amico, Daniela Belli; Boschi, Daniele; Calderazzo, Fausto; Labella, Luca; Marchetti, Fabio (28 February 2002). "Synthesis, and crystal and molecular structures of the triflato and trifluoroacetato complexes of zinc, Zn(O3SCF3)2(DME)2 and [Zn(O2CCF3)2(DME)n"]. Inorganica Chimica Acta 330 (1): 149–154. doi:10.1016/S0020-1693(01)00739-3. http://144.206.159.178/ft/458/52133/914984.pdf.
10. ↑ "MSDS - 176176". https://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=176176&brand=ALDRICH&PageToGoToURL=https://www.sigmaaldrich.com/catalog/product/aldrich/176176?lang=en.

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*[CID]: Compound ID
*[H272]: May intensify fire: oxidizer
*[H302]: Harmful if swallowed
*[H314]: Causes severe skin burns and eye damage
*[H335]: May cause respiratory irritation