Chemistry:Dichlorodifluoroethylene
 1,1-Dichloro-2,2-difluoroethylene
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| IUPAC names
1,1-Dichloro-2,2-difluoroethene
(Z)-1,2-Dichloro-1,2-difluoroethene (E)-1,2-Dichloro-1,2-difluoroethene | |||
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3D model (JSmol)
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| Properties | |||
| C2Cl2F2 | |||
| Molar mass | 132.92 g·mol−1 | ||
| -60.0·10−6 cm3/mol | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |||
 verify (what is   ?)
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A dichlorodifluoroethylene (systematically named dichlorodifluoroethene) is one of three compounds with the chemical formula C2Cl2F2. 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
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.
References
- ↑ "1,1-Dichlorodifluoroethylene | 79-35-6 suppliers - BuyersGuideChem". http://www.buyersguidechem.com/chemical_supplier/1,1-Dichlorodifluoroethylene.php.
- ↑ "Process for the preparation of 1,2-difluoro-ethylene and 1-chloro-1,2-difluoro-ethylene". http://www.google.nl/patents/US5118888.
- ↑ "Refrigeration Technologies: Knowledge Center: Toxic Info: Refrigerant Safety Profile". http://refrigtech.com/Knowledge_Center/Toxic_Info/zsafety.html.
- ↑ "Organic Syntheses Procedure". http://www.orgsyn.org/demo.aspx?prep=cv4p0268.
- ↑ 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 (ACS Publications) 87 (19): 4223–4230. doi:10.1021/ja00947a001.
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