F Bromomethane

Barium, Halocarbons, 0200 Beryllium, Halocarbons, 0220 f Bromomethane, Metals, 0429 Chloroform, Metals, 0372 Plutonium, Carbon tetrachloride, 4888 Samarium, 1,1,2-Trichlorotrifluoroethane, 4911 Tin, Carbon tetrachloride, Water, 4912 Titanium, Halocarbons, 4919 Uranium, Carbon tetrachloride, 4923 Zirconium, Carbon tetrachloride, 4928 See also HALOCARBONS METALS... 

Bromoform, 0368 f Bromomethane, 0429 f l-Bromo-3-methylbutane, 1984 f l-Bromo-2-methyIpropane, 1633 f 2-Bromo-2-methyIpropane, 1634 f 2-Bromopentane, 1985 f 1-Bromopropane, 1241 f 2-Bromopropane, 1242... 

Because bromomethane is a gas above 3.6 °C (38 °F), most disposal is by release to the atmosphere (see Section 5.2.1). Disposal of liquid or solid wastes that contain bromomethane is regulated by federal restrictions which apply to hazardous substances (see Chapter 7). 

Secondly, we have labeled one of the substituted methanes 5-fluorochloro bromomethane and the other f -fluorochlorobromomethane. S (sinister, left) and R (rectus, right) are labels that are useful in designating the absolute configuration of chiral molecules in space. The rules for assigning S stereochemistry in one case and R stereochemistry in the other are somewhat complex but it doesn t matter, so never mind. The point is that we have a way of talking about the two possibilities. 

Thier, R., Pemble, S.E., Kramer. H.. Taylor, J.B., Guengerich, F.P. Ketterer, B. (1996) Human glutathione S-transferase Tl-1 enhances mutagenicity of 1,2-dibromoethane, bromomethane and 1,2,3,4-diepoxy butane in Salmonella typhimurium. Carcinogenesis, 17, 163-166... 

Bromotrifluoromethane or Trifluoromono-bromomethane ("Freon 13B1 or "F—13B1 ) BrCF 3, mw 148.93 colorless gas, fr p —175°, bp —58°(760mm) nonflammable. Can be prepd by heating trifluoromethane Br in a pyrex tube at 600°(Ref 1). Used in fire extinguishers and refrigerants Refs 1) Beil 1, 831 <73> 2) Lange... 

Bromomethanes at single locations in the South Atlantic normally show lower concentrations than or similar to those measured for the Southern Ocean. For example, Class and Ballschmiter determined the bromoform and dibromomethane concentration at 6° S, 6° W to be 0.8 and 0.3 ng F (3), whereas Abrahamson and Klick measured higher contents of 4.5 and 1.3 ng l at 52° S, 6°W (55), respectively. The latter authors also reported low concentrations of iodochloromethane and iodopropane in the range of 0.07-0.13 ng 1 in an Antarctic sea water sample. That diiodomethane is the dominant iodinated compound in coastal waters, especially during spring, was found by Klick on the Swedish coast (56). This confirms the results listed in Table 7.1 for Arctic coastal water. 

BROMOMETHANE (74-83-9) CHjBr Combustible gas, but not easily ignited it has narrow flammability limits in air [explosion limits in air (vol %) 10 to 16 autoignition temp 999 F/537°C Fire Rating 1]. The sensitivity of these limits may be widened by pressure contact with oxygen, aluminum. 

Dienes are straightforward to prepare using the Ramberg-BScklund reaction. The only requirement is that a double bond is already present on the substrate. We saw earlier examples such as dienes 24, 26, 55, and 70. Moreover, Block s bromomethane-sulfonyl bromide (22) was a powerful reagent for generating substrates to make dienes, eneynes, and polyenes. As shown below, addition of 22 to olefin 86 under photolysis gave the adduct which underwent an elimination of HBr under the influence of Et3N to provide bromosulfone 87. Treatment of 87 with potassium f-butoxide then delivered diene 8S.23 In the same vein, cyclohexenes 89 and 91 were conveniently converted to dienes 90 and 92, respectively. 

In a review of compounds identified in tobacco and tobacco smoke, Philip Morris, Inc. in 1963 (2939) listed seven halogenated compounds Cl, bromomethane, chlo-romethane, chloroethane, bromoethane, Endrin , and TDE. Stedman (3797) in 1968 listed 950 identified compounds in tobacco and tobacco smoke, of these only seventeen compounds were halogen-containing. Cl, F, and I were identified in tobacco, along with tobacco residues of methylene bromide, l,l,l-trichloro-2-(4,4 -dichlorodiphenyl)ethane (DDT), Dieldrin , Dyrene , Endrin , TDE, Telodrin , Thiodan , Toxaphene , Trichlorfon , and Diclone . o-Chloroaniline,... 

BROMOMETHANE. CHjBr. In limited laboratoiy tests, bromomethane was veiy corrosive to high purity aluminum at S0°C (I22°F). See also Ref (3) p. lOS. 

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