Dichlorodifluoroethylene

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A dichlorodifluoroethylene (systematically named dichlorodifluoroethene) is one of three compounds with the chemical formula C
2Cl
2F
2. Dichlorodifluoroethylenes are colourless gases, and are some of the simplest chlorodifluoroalkenes. Two of the compounds are diastereomeric.

Both structural isomers are used as intermediates or precursors in the production of other industrial chemicals.[1][2]

1,1-Dichloro-2,2-difluoroethylene

1,1-dichloro-2,2-difluoroethylene is a low-boiling liquid that is used a refrigerant.[3] 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).[4]

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.[5] The cis isomer's ASHRAE number is R-1112c, and its CAS number is 311-81-9. Its melting point is −119.6 °C (−183.3 °F).[5] The trans isomer's ASHRAE number is R-1112t, and its CAS number is 381-71-5. Its melting point is −93.3 °C (−135.9 °F).[5] The diastereomers are commercially only available as a mixtures of varying proportions.

External links

References

  1. ↑ http://www.buyersguidechem.com/chemical_supplier/1,1-Dichlorodifluoroethylene.php retrieved 26 December 2013
  2. ↑ http://www.google.nl/patents/US5118888 retrieved 26 December 2013
  3. ↑ http://refrigtech.com/Knowledge_Center/Toxic_Info/zsafety.html
  4. ↑ http://www.orgsyn.org/demo.aspx?prep=cv4p0268
  5. ↑ 5.0 5.1 5.2 Craig, Norman C.; Evans, David A. (5 October 1965). "Infrared and Raman spectra of cis- and trans-1,2-dichloro-1,2-difluoroethylene". Journal of the American Chemical Society (PDF) (ACS Publications) 87 (19): 4223–4230. doi:10.1021/ja00947a001. 
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