 1,1-Dichloro-2,2-difluoroethylene
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| Names | |||
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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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| ECHA InfoCard | 100.001.090 | ||
PubChem CID
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CompTox Dashboard (EPA)
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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).
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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.
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". www.buyersguidechem.com. Retrieved 26 December 2013.
- ^ "Process for the preparation of 1,2-difluoro-ethylene and 1-chloro-1,2-difluoro-ethylene". www.google.nl. Retrieved 26 December 2013.
- ^ "Refrigeration Technologies: Knowledge Center: Toxic Info: Refrigerant Safety Profile". Archived from the original on 2013-12-24. Retrieved 2013-12-05.
- ^ "Organic Syntheses Procedure".
- ^ 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. 87 (19). ACS Publications: 4223–4230. doi:10.1021/ja00947a001.
External links
This page was last edited on 23 August 2022, at 21:09