Hexafluoro-2-butyne

Hexafluoro-2-butyne
Names
	Preferred IUPAC name 1,1,1,4,4,4-Hexafluorobut-2-yne
	Other names HFB
Identifiers
CAS Number	692-50-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	62855 ;
ECHA InfoCard	100.010.667
EC Number	211-732-7;
PubChem CID	69654;
RTECS number	ES0702500;
CompTox Dashboard (EPA)	DTXSID3061003 ;
	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	162.034 g·mol−1
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
	Occupational safety and health (OHS/OSH):
Main hazards	Toxic gas
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H331
Precautionary statements	P261, P311, P410+P403
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). verify (what is ?) Infobox references

Hexafluoro-2-butyne (HFB) is a fluorocarbon with the chemical structure CF₃C≡CCF₃. HFB is a particularly electrophilic acetylene derivative, and hence a potent dienophile for Diels–Alder reactions.