Octafluorocyclobutane

Octafluorocyclobutane
IUPAC name

Octafluorocyclobutane
Other names

Freon-C-318, perfluorocyclobutane
Identifiers
CAS number 115-25-3 Y
EC number 204-075-2
Properties
Molecular formula C4F8
Molar mass 200.03 g/mol
Appearance colourless gas
Density 1.654 at -20 °C

8.460 kg/m^3 (gas at 15°C and 1 atm), ~6.91 times air)
Melting point

-40.1 °C
Boiling point

-6 °C
Solubility in water low
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Octafluorocyclobutane, or perfluorocyclobutane, C4F8, is an organofluorine compound which enjoys several niche applications. It is related to cyclobutane by replacement of all C-H bonds with C-F bonds. Octafluorocyclobutane is produced by the dimerization of tetrafluoroethylene and the reductive coupling of 1,2-dichloro-1,1,2,2-tetrafluoroethane.[1]

Applications

In the production semiconductor materials and devices, octafluorocyclobutane serves as a deposition gas and etchant. It has also been investigated as a refrigerant in specialised applications, as a replacement for ozone depleting chlorofluorocarbon refrigerants. Exploiting its volatility and chemical inertness, octafluorocyclobutane may be found in some aerosolized foods. It is listed by the Codex Alimentarius under number E946. It is investigated as a possible replacement for sulfur hexafluoride as a dielectric gas.

References

  1. ^ G. Siegemund, W. Schwertfeger, A. Feiring, B. Smart, F. Behr, H. Vogel, B. McKusick “Fluorine Compounds, Organic” in “Ullmann’s Encyclopedia of Industrial Chemistry” 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a11 349

Appendix

Its critical point is at 115.3 °C and 2.79 MPa.