Dichlorofluoromethane Freon

Dichloroethylene cis-1,2-Dichloroethylene trans-1,2-Dichloroethylene Dichlorofluoromethane (Freon 21) Dichloromethane... 

Freon 21. See Dichlorofluoromethane Freon 22. See Chlorodifluoromethane Freon 23. See Trifluoromethane Freon 30. See Methylene chloride Freon 31. See Chlorofluoromethane Freon 112. See 1,1,2,2-Tetrachloro-1,2-difluoroethane... 

In connection with the study of the role Freon compounds play in the depletion of ozone in the atmosphere, a demand has arisen for 13C-labeled fluorinated hydrocarbons in infrared spectroscopic examination. For this purpose,13C-isotopically enriched trichlorofluoromethane, dichlorodifluoromethane, chlorotrifluoromethane, trifluoromethane, chlorodifluoromethane, and dichlorofluoromethane have been prepared from 13CC 4 and 13CHC13.73... 

Synonyms/Trade Names Dichlorofluoromethane, Fluorodichloromethane, Freon 21. Genetron 21, Halon 112, Refrigerant 21... 

A. Inhalation. The toxic air level is quite variable, depending on the specific agent (see Table IV-4, p 532). Freon 21 (dichlorofluoromethane TLV 10 ppm [42 m m ) is much more toxic that freons 12 and 22 (TLV 1000 ppm). In general, anesthetic or CNS-depressant doses require fairly large air concentrations, which can also displace oxygen, leading to asphyxia. The air level of dichloromonofluoromethane considered immediately dangerous to life or health (IDLH) is 5000. Other TLV and IDLH values can be found in Table IV-4 (p 532). 

A minor constituent of the atmosphere. The most important trace gases contributing to the greenhouse effect are water vapor, carbon dioxide, ozone, methane, ammonia, nitric acid, nitrous oxide, ethylene, sulfur dioxide, nitric oxide, dichlorofluoromethane or Freon 12, trichlorofluoromethane or Freon 11, methyl chloride, carbon monoxide, and carbon tetrachloride, transient tracers... 

Let s use dichlorofluoromethane (CF Cl sold under the brand-name Freon-12) to illustrate the sequence of ozone-desffoying reactions ... 

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