2,3,3,3-Tetrafluoropropene

2,3,3,3-Tetrafluoropropene, HFO-1234yf, is a hydrofluoroolefin (HFO) with the formula CH2=CFCF3. It is also designated R-1234yf as the first of a new class of refrigerants: it is marketed under the name Opteon YF by Chemours and as Solstice YF by Honeywell. R-1234yf is also a component of zeotropic refrigerant blend R-454B, an alternative to the R-410A refrigerant currently used in air conditioning and heat pump applications.

2,3,3,3-Tetrafluoropropene
Names
Preferred IUPAC name
2,3,3,3-Tetrafluoroprop-1-ene
Other names
HFO-1234yf; R1234yf; R-1234yf; 2,3,3,3-Tetrafluoropropylene
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.104.879
EC Number
  • 468-710-7
UNII
UN number 3161
  • InChI=1S/C3H2F4/c1-2(4)3(5,6)7/h1H2 Y
    Key: FXRLMCRCYDHQFW-UHFFFAOYSA-N Y
  • InChI=1/C3H2F4/c1-2(4)3(5,6)7/h1H2
    Key: FXRLMCRCYDHQFW-UHFFFAOYAB
  • C=C(F)C(F)(F)F
  • FC(=C)C(F)(F)F
Properties
C3H2F4
Molar mass 114 g/mol
Appearance Colorless gas
Density 1.1 g/cm3 at 25 °C (liquid); 4 (gas, relative, air is 1)
Boiling point −30 °C (−22 °F; 243 K)
198.2 mg/L at 24 °C, 92/69/EEC, A.6
log P 2.15, n-octanol/water, 92/69/EEC, A.8
Vapor pressure 6,067 hPa at 21.1 °C; 14,203 hPa at 54.4 °C
Hazards
GHS labelling:
H220, H280
P210, P260, P281, P308+P313, P410+P403
405 °C (761 °F; 678 K)
Explosive limits 6.2% vol.; 12.3% vol.
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

HFO-1234yf has a global warming potential (GWP) of less than 1, compared to 1,430 for R-134a and 1 for carbon dioxide. This colorless gas is being used as a replacement for R-134a as a refrigerant in automobile air conditioners. As of 2022, 90% of new U.S. vehicles from original equipment manufacturers (OEMs) are estimated to use HFO-1234yf. One drawback is it breaks down into persistent organic pollutant short chain perfluorinated carboxylic acids (PFCAs).

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