A dichlorodifluoroethylene (systematically named dichlorodifluoroethene) is one of three compounds with the

chemical formula A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as pare ...

. Dichlorodifluoroethylenes are colourless gases, and are some of the simplest chlorodifluoroalkenes. The

structural isomer In chemistry, a structural isomer (or constitutional isomer in the IUPAC nomenclature) of a compound is a compound that contains the same number and type of atoms, but with a different connectivity (i.e. arrangement of bonds) between them. The ...

s 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 A refrigerant is a working fluid used in the cooling, heating, or reverse cooling/heating cycles of air conditioning systems and heat pumps, where they undergo a repeated phase transition from a liquid to a gas and back again. Refrigerants are ...

. It may also be used as a

solvent A solvent (from the Latin language, Latin ''wikt:solvo#Latin, solvō'', "loosen, untie, solve") is a substance that dissolves a solute, resulting in a Solution (chemistry), solution. A solvent is usually a liquid but can also be a solid, a gas ...

, 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 Dangerous goods are substances that are a risk to health, safety, property or the environment during transport. Certain dangerous goods that pose risks even when not being transported are known as hazardous materials ( syllabically abbreviate ...

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 The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE ) is an American professional association seeking to advance heating, ventilation, air conditioning and refrigeration (HVAC&R) systems design and constructio ...

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 . The trans isomer's ASHRAE number is R-1112t, and its CAS number is 381-71-5. Its melting point is . The diastereomers are commercially only available as a mixtures of varying proportions.

References

{{Reflist, 2

External links

MSDS
Chlorofluorocarbons Refrigerants Chloroalkenes Fluoroalkenes