Dichlorodifluoroethylene

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Dichlorodifluoroethylene
1,1-Dichloro-2,2-difluoroethylene.svg
1,1-Dichloro-2,2-difluoroethylene
Cis-1,2-dichloro-1,2-difluoroethylene.svg
cis-1,2-Dichloro-1,2-difluoroethylene
Trans-1,2-dichloro-1,2-difluoroethylene.svg
trans-1,2-Dichloro-1,2-difluoroethylene
Identifiers
CAS number 79-35-6 YesY, 311-81-9, 381-71-5
PubChem 6592, 2736814, 3032334
ChemSpider 21106435 YesY, 2018468, 2297331
Jmol-3D images Image 1
Image 2
Image 3
Properties
Molecular formula C2Cl2F2
Molar mass 132.92 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

A dichlorodifluoroethylene (systematically named dichlorodifluoroethene) is one of three compounds with the chemical formula C
2
Cl
2
F
2
. 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][2]

1,1-Dichloro-2,2-difluoroethylene[edit]

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[edit]

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.

References[edit]

  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. ^ a b c 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. 

External links[edit]