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dichlorodifluoromethane
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Dichlorodifluoromethane (R-12) is a colorless gas usually sold under the brand name Freon-12, and a chlorofluorocarbon halomethane (CFC) used as a refrigerant and aerosol spray propellant. Complying with the Montreal Protocol, its manufacture was universally banned in 1996 due to concerns about its damaging impact to the ozone layer.〔(Dichlorodifluoromethane at LearnChemistry (Royal Society of Chemistry) )〕 Its only allowed usage is as fire retardant in submarines and aircraft. It is soluble in many organic solvents. Dichlorodifluoromethane was one of the original propellants for Silly String. R-12 cylinders are colored white.
==Preparation==
It can be prepared by reacting carbon tetrachloride with hydrogen fluoride in the presence of a catalytic amount of antimony pentachloride:
CCl4 + 2HF → CCl2F2 + 2HCl
This reaction can also produce trichlorofluoromethane (CCl3F), chlorotrifluoromethane (CClF3) and tetrafluoromethane (CF4).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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