75-69-4 Trichlorofluoromethane

Dichlorodifluoromethane and Trichlorofluoromethane.60 In a flask connected to an ice-cooled reflux condenser, a mixture of 2 moles of carbon tetrachloride and 1 mole of antimony trifluoride is cooled to 0°. After addition of 0.1 mole of antimony pentachloride, the mixture is allowed to warm until the reaction starts. The reaction is regulated by intermittent cooling and heating in order not to overtax the reflux condenser. The uncondensed vapors are led to a receiver cooled with solid carbon dioxide. The distillate is a mixture of CCl3F(b.p. 25°) and CCl2F2(b.p. —30°) whose composition depends on the efficiency of the dephlegmation but is usually 50-50 in a laboratory operation. At the 

1000 ppm OSHA ceiling 1000 ppm ACGIH ceiling 5000 lbs CERCLA Sec. 103 RQ 10000 ppm immediately dangerous to life and health 13 pph/15 min RAT LC50 

Acute exposure may cause irritation of nose, throat, upper respiratory tract, bronchospasms. Higher concentrations may cause central nervous system depression, headache dizziness, tiimitus and tremors. Severe exposure can result in nausea, vomiting, unconsciousness, coma, candiac arrythymias and death. 

Stable under normal conditions of temperature and pressure. May attack some plastics and rabber. There is a potential explosion hazard with aluminum. Decomposition may yield corrosive acid gases and phosgene. 

Self contained breathing apparatus operating under positive pressure mode. If contact with the hquid is a possibility then impervious clothing, gloves, and splash proof goggles should be worn. 

Ventilate area. Keep urmecessary personnel away. Stop leak if it can be done without risk. Remove leak to exhausted enclosure and direct away from occupied areas. 

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It is the use of LIDAR devices as tools for spectroscopic measurements on the various gases present in the atmosphere which concerns us here. These include ozone, carbon dioxide, the CFCs (chlorofluorocarbons, such as CFC-11, trichlorofluoromethane, and CFC-12, dichlorodifluoromethane, used as refrigerants) and all those molecules regarded as atmospheric pollutants. 

Economic Aspects. The estimated worldwide production of important industrial CFCs is shown in Table 5. Trichlorofluoromethane, dichlorodifluoromethane, and trichlorotrifluoroethane account for over 95% of the total production. Between 1986 and 1991 the production of CFCs has decreased dramatically due to global adherence to the provisions of the Montreal Protocol and eventually will be phased out entirely. Estimates of the distribution by use in 1986 and subsequent reductions in use are shown in Table 6. 

Finally, the metallisation layer usually requires patterning, which can be done by reactive ion etching (RIE) or back-sputtering. The two processes are similar. In both techniques accelerated ions hit the substrate and forcibly detach atoms or molecules from the surface. RIE uses reactive gases such as chlorine, Cl or trichlorofluoromethane [75-69-4] CCl E. Inert gases such as argon or neon are used in back-sputtering. 

Chlo r ofluo r oca rho ns. I,I,I-trichloro-2,2,2-trifluoroethane trichlorofluoromethane, dichlorodifluoromethane chlorodifluoro-methane I,2-dichloro-I,I,2,2-tetrafluoroethane chloropentafluoro-ethane... 

Trichlorofluoromethane (Freon 11) is available from E. I. duPont de Nemours and Company, Inc., or Matheson Gas Products. 

Trichlorofluoromethane T Steel, cast iron, brass. Some of the opposite at high... 

The formed mixture is composed of trichlorofluoromethane (Freon-11) and dichlorodifluoromethane (Freon-12). These compounds are used as aerosols and as refrigerants. Due to the depleting effect of chlorofluorocarbons (CFCs) on the ozone layer, the production of these compounds may be reduced appreciably. 

Fluorination. Direct fluorination of quinoline was accompanied by extensive fragmentation of the heteroring, but trifluoromethyl hypofluorite in trichlorofluoromethane at -70°C converted 5-fluoro-8-hydroxyquino-line into the 5,7-difluoro-8-hydroxy product (72JMC987). Quinoline, itself, was perfluorinated by fluorine and cobalt(III) fluoride (56JCS783), whereas cesium tetrafluorocobaltate at around 350°C converted it into a mixture of saturated polyfluoro compounds (82JFC413). It is much more satisfactory to introduce fluorine by nucleophilic methods. 

The spectral properties of pentafluorophenylcopper te-tramer are as follows infrared (Nujol) cm. 1630 medium 1391 medium 1353 medium 1275 medium 1090,1081, and 1071 strong triplet 978 strong 785 medium fluorine magnetic resonance (tetrahydrofuran with trichlorofluoromethane as internal reference) 8 (multiplicity, number of fluorines, assignment, coupling constant J in Hz.) 107.2 (20-line multiple , 2, ortho F), 153.4 (triplet of triplets, 1, para F, J= 1.3 and 20), 162.3 (17-line multiplet, 2, meta F). Absorptions at 820-900, 1100-1125, and 1290 cm.- in the infrared spectrum and at 8 3.05 in the proton magnetic resonance spectrum indicate that dioxane is still present. 

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