Octafluorocyclobutane

Octafluorocyclobutane

Names
IUPAC name Octafluorocyclobutane
Other names Freon-C-318, perfluorocyclobutane
Identifiers
CAS Number	115-25-3 Y
3D model (Jmol)	Interactive image
ChEBI	CHEBI:31007 N
ChEMBL	ChEMBL444147 N
ChemSpider	13846040 N
ECHA InfoCard	100.003.705
EC Number	204-075-2
E number	E946 (glazing agents, ...)
InChI InChI=1S/C4F8/c5-1(6)2(7,8)4(11,12)3(1,9)10 N Key: BCCOBQSFUDVTJQ-UHFFFAOYSA-N N InChI=1/C4F8/c5-1(6)2(7,8)4(11,12)3(1,9)10 Key: BCCOBQSFUDVTJQ-UHFFFAOYAW
SMILES C1(C(C(C1(F)F)(F)F)(F)F)(F)F
Properties
Chemical formula	C4F8
Molar mass	200.03 g/mol
Appearance	colourless gas
Density	1.637 g/cm3 at −5.8 °C (liquid) 9.97 kg/m3 at −6 °C and 1 atm (gas) 8.82 kg/m3 15 °C and 1 atm (gas)
Melting point	−40.1 °C (−40.2 °F; 233.1 K)
Boiling point	−5.8 °C (21.6 °F; 267.3 K)
Solubility in water	0.016 vol/vol (1.013 bar and 20 °C)
Viscosity	109e-6 Poise (1.013 bar and 0 °C)
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

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 of semiconductor materials and devices, octafluorocyclobutane serves as a deposition gas and etchant.^[2] 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 946 (E946 for EU). It is investigated as a possible replacement for sulfur hexafluoride as a dielectric gas.

References

1. ↑ Siegemund, G.; Schwertfeger, W.; Feiring, A.; Smart, B.; Behr, F.; Vogel, H.; McKusick, B. (2005), "Fluorine Compounds, Organic", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a11_349  CS1 maint: Multiple names: authors list (link)
2. ↑ "Octafluorocyclobutane (RC318)". Gas Encyclopaedia. Air Liquide. Retrieved May 15, 2013. 

Appendix

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