Hexafluoro-2-butyne

Hexafluoro-2-butyne

Names
IUPAC name 1,1,1,4,4,4-Hexafluoro-2-butyne
Other names HFB
Identifiers
CAS Number	692-50-2
3D model (Jmol)	Interactive image
ChemSpider	62855
ECHA InfoCard	100.010.667
PubChem	69654
RTECS number	ES0702500
InChI InChI=1S/C4F6/c5-3(6,7)1-2-4(8,9)10 Key: WBCLXFIDEDJGCC-UHFFFAOYSA-N InChI=1/C4F6/c5-3(6,7)1-2-4(8,9)10 Key: WBCLXFIDEDJGCC-UHFFFAOYAY
SMILES FC(F)(F)C#CC(F)(F)F
Properties
Chemical formula	C4F6
Molar mass	162.03 g/mol
Appearance	Colorless gas
Density	1.602 g/cm3
Melting point	−117 °C (−179 °F; 156 K)
Boiling point	−25 °C (−13 °F; 248 K)
Solubility in water	Insoluble
Structure
Dipole moment	0 D
Hazards
Main hazards	Toxic gas
R-phrases	R12 R23
S-phrases	S16 S33 S45
Related compounds
Related compounds	Dimethyl acetylenedicarboxylate Hexachlorobutadiene Acetylene
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

Hexafluoro-2-butyne is the fluorocarbon with the formula CF₃C≡CCF₃. HFB, as it is known also, is a particularly electrophilic acetylene, hence a potent dienophile for Diels–Alder reactions.

It is prepared by the action of sulfur tetrafluoride on acetylenedicarboxylic acid and the reaction of KF with hexachlorobutadiene.