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Dichlorodifluoroethylene

(Z)-1,2-Dichloro-1,2-difluoroethene (E)-1,2-Dichloro-1,2-difluoroethene

A dichlorodifluoroethylene (systematically named dichlorodifluoroethene) is one of three compounds with the chemical formula . Dichlorodifluoroethylenes are colourless gases, and are some of the simplest chlorodifluoroalkenes.

The structural isomers are used as intermediates or precursors in the production of other industrial chemicals.

1,1-Dichloro-2,2-difluoroethylene

1,1-Dichloro-2,2-difluoroethylene is a low-boiling liquid that is used a refrigerant. It may also be used as a solvent, but has practical limitations as such, because of its low boiling point (commercial listings, 19 °C; lit. 17 °C).

It is regarded as a hazardous chemical for being toxic by inhalation (see MSDS), and a low-boiling liquid, and it causes irritation when it comes into contact with the skin and mucous membranes. Its ASHRAE number is R-1112a, and its CAS number is 79-35-6. Concentrated 1,1-dichloro-2,2-difluoroethylene can be ignited with ease in the laboratory.

''cis''- and ''trans''-1,2-dichloro-1,2-difluoroethylene

The diastereomers were co-isolated first in 1965, by using a combination of fractional melting and fractional distillation. The cis isomer's ASHRAE number is R-1112c, and its CAS number is 311-81-9. Its melting point is −119.6 C. The trans isomer's ASHRAE number is R-1112t, and its CAS number is 381-71-5. Its melting point is −93.3 C. The diastereomers are commercially only available as a mixtures of varying proportions.

References

References

  1. "1,1-Dichlorodifluoroethylene | 79-35-6 suppliers - BuyersGuideChem".
  2. "Process for the preparation of 1,2-difluoro-ethylene and 1-chloro-1,2-difluoro-ethylene".
  3. "Refrigeration Technologies: Knowledge Center: Toxic Info: Refrigerant Safety Profile".
  4. "Organic Syntheses Procedure".
  5. Craig, Norman C.. (5 October 1965). "Infrared and Raman spectra of ''cis''- and ''trans''-1,2-dichloro-1,2-difluoroethylene". ACS Publications.
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chlorofluorocarbons refrigerants haloalkenes
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