Bromine trifluoride, conductivity temperature

Some BrF is also formed in the reaction, and it can be separated by fractional distillation. Bromine trifluoride is a liquid at room temperature and shows an electrical conductivity high enough to indicate some autoionization, which is usually represented by the reaction... 

T he interest in conductivity measurements on fluorinated inorganic com pounds at cryogenic temperatures lies in the ability of these compounds to form ions for possible synthesis of potential solid oxidizers. In this study we are concerned with the conductivity measurements of solid chlorine and bromine trifluorides to determine their electrical conductivities and its bearing on structural problems. Specific conductivities of <10" at 0° C. (I) and 10 ohm-1cm. 1 (3) have been reported for chlorine trifluoride and 8.0 X l ohm-1cm. 1 at 25° C. (1) for bromine trifluoride. In this work a conductivity cell has been developed for measuring fluorine-containing oxidizers at cryogenic temperatures. The variations of conductivity with temperature of chlorine trifluoride have been measured from +11.3° C. (b.p.) to —130° C. (well below m.p., —83° C.) and of bromine trifluoride from -j-80° C. to —196° C. (m.p., 8.8° C.). Possible mechanisms are discussed. 

Figure 5. Conductivity of bromine trifluoride as a function of temperature...

Boron trifluoride and boron trifluoride-diethyl ether complex can be used as a source of fluoride ions in the presence of hypobromites and hypochlorites, e.g. methyl hypobromitc, tert-butyl hypobromite, methyl hypochlorite in carbon tetrachloride at 25 C. The addition of bromine monofluoride" and chlorine monofluoride" to various alkenes is accompanied by the formation of the corresponding alkoxybromides and alkoxychlorides which hinder the isolation of the halofluorinated products.57 jV-Bromo- and A -chloro-substiluted alkyl- and arylamines. -amides, and -imides, A -chloro-A,-methylamine, A -bromo-A -methylamine, A -chloro-A, /V-dimethylamine, A-bromo-A.A-dimethylamine, ACV-dichloro-A -methylamine, V,fV-dibromo-,V-mcthylaminc, A -bromosuccinimide, -V-chlorosuccinimide, Af-bromoacct-amide, A.A -dichlorourethane, can be used in the reaction instead of the hypohalites. The reactions with various alkenes conducted in dichloromethane at room temperature in the presence of boron trifluoride-diethyl ether complex produce bromofluoro and chlorofluoro addition products in 40-80 % yield. However, the reactions are complicated by the addition of A -halo-succinimides and Af.A-dichlorourcthane to the C = C bonds.58... 

Caution. All reactions should be conducted In a well-ventilated fume hood with appropriate precautions. Arsenic and antimony pentafluoride and arsenic trifluoride are very poisonous and hydrolyze readily to form Bromine is corrosive and is harmful to the skin and mucous membranes. Sulfur dioxide is poisonous and can generate 3 to 4 atmospheres pressure at room temperature. Well-constructed glass vessels or metal systems must be employed to prevent pressure bursts. The use of rubber gloves, safety glasses, and face shields is recommended. 

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