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Chemical structure of 1,3,3,3-tetrafluoropropene (HFO-1234ze)

Hydrofluoroolefins (HFOs) are chemical compounds composed of hydrogen, fluorine and carbon. They are distinguished from hydrofluorocarbons (HFCs) by being derivatives of alkenes (olefins) rather than alkanes.

HFOs are being developed as "fourth generation" refrigerants with a thousand time lower global-warming potential than HFCs.[1][2][3] HFOs currently in use include 2,3,3,3-tetrafluoropropene (HFO-1234yf) and 1,3,3,3-tetrafluoropropene (HFO-1234ze).[1][4] 1-Chloro-3,3,3-trifluoropropene (HFO-1233zd) is also under development.[5]


  1. ^ a b "HETEROGENEOUS CATALYSIS UNDER MICROWAVE HEATING" (PDF). La Chimica l'Industria (in Italian). Società Chimica Italiana (4): 22. May 2012. 
  2. ^ HFO, i nuovi gas refirgerant
  3. ^ Hydrofluoroolefins (HFOs), European Fluorocarbons Technical Committee
  4. ^ Honeywell Sells Novel Low-Global-Warming Blowing Agent To European Customers, Honeywell press release, Oct. 7, 2008
  5. ^ Cheryl Hogue (2011). "Replacing the Replacements". Chemical & Engineering News. 89 (49): 31–32.