Methane tetrabromide

SYNS BROMID UHUCITY D CARBON BROMIDE METHANE, TETRABROMIDE METHANE, TETRABROMO- TETRABROMIDE METHANE TETRABROMOMETHANE... 

Synonyms/Trade Names Carbon bromide. Methane tetrabromide, Tetrabromomethane... 

Synonyms Carbon bromide Methane tetrabromide Tetrabromomethane... 

Biedermann and Jacobson, who first prepared thieno[2,3-6]-thiophene (1) in 1886, characterized it as a 2,3,4,5-tetrabromo derivative with m.p. 172°. Later Capelle reported the isolation of a dibromo derivative of thienothiophene 1 with m.p. 122.5°, which was shown by Challenger and Harrison to be 2,3,5-tribromothieno[2,3-6]thiophene (m.p. 123°-124°). Capelle also obtained a tetrabromide, m.p. 223°, by bromination of the product of reaction of acetylene with sulfur. The tetrabromide seems to be identical with that prepared from the product of reaction of methane, acetylene, and hydrogen sulfide, m.p. 229°-230°, and is evidently 2,3,5,6-tetrabromothieno[3,2-6j-thiophene. ... 

Figures 20.4.4(a) and 20.4.4(b) illustrate the crystal structure of the 1 1 complex of tetraphenylmethane and carbon tetrabromide. The nodes comprise C(C6H5)4 and CBr4 molecules, and the each linking rod is the weak interaction between a Br atom and a phenyl group. The hexamethylenetetramine-like structural unit is outlined by broken lines. Figures 20.4.4(c) and 20.4.4(d) show the crystal structure of tetrakis(4-bromophenyl)methane, which has a distorted diamondoid network based on the hexamethylenetetramine building unit. If the synthon composed of the aggregation of four Br atoms is considered as a node, then two kinds of nodes (Br4 synthon and quatenary C atom) are connected by rods consisting of p-phenylene moeities.

The simplest iodoalkane, CH3I, has been studied repeatedly by MW and ED (Table 43). The re value for the C—I distance from a combined MW/IR investigation and the rg value which is reported in a recent ED analysis of the entire series of the iodomethanes CH I, n = 1 to 4, are in perfect agreement. The gas-phase studies for the methanes with two or more iodines were performed at 360 K for CH2I2, at 400 K for CHI3 and at 425 K for CI4. Within the combined experimental uncertainties the C—I bond distances remain constant for mono-, di- and triiodomethane and increases by ca 3 pm in carbon tetraiodide. As in the case of carbon tetrachloride and tetrabromide, this increased bond length in CI4 can be rationalized by steric repulsions between the iodine atoms. The large steric requirement of... 

Steacie comments that if the mechanism is correct in principle, this reaction must have an activation energy not greater than 5 kcal. This implies that Z)(G - Br) in carbon tetrabromide must be less than 50 kcal, which Steacie considers to be a surprisingly low result. It is, however, in line with other recent evidence on D C - Br) in other halogen substituted methanes. 

Dimethyl ditellurium is formed when methyl radicals, generated by thermal decomposition of methane butane, diethyl ether, or dimethyl ether interact with tellurium mirrors. Because dimethyl ditellurium can be prepared more conveniently by other methods, these reactions are not of synthetic importance. However, this reaction is one of the two ways to prepare bis[trifluoromethyl] ditellurium. Thus, this compound was prepared through interaction of trifluoromethyl radicals with tellurium tetrachloride , tellurium tetrabromide " or tellurium "... 

The impurities in silicium tetrabromide were identified The packing irreversibly adsorbs SiBr4 methane and chlorine were not separated, but they could be determined simultaneously by using FID for CH4 and an ECD for chlorine. 

Methane reacts with bromine, again at high temperatures or under the influence of ultraviolet light, to yield the corresponding bromomethanes methyl bromide, methylene bromide, bromoform, and carbon tetrabromide. 

Synonyms Carbon bromide Tetrabromide methane Tetrabromo methane... 

Tetrakis[(diphenylphosphino)methyl]methane has been similarly prepared from pentaerythritol tetrabromide.217 The more reactive potassium diphenyl-phosphide permits the preparation also of ditertiary aromatic phosphines.218... 

Radical addition of halo methanes to olefins was achieved by Kharasch and his co-workers98,99 when they warmed a mixture of an olefin with, e.g., carbon tetrabromide or an excess of carbon tetrachloride in the presence of 1-5 mole % of a diacyl peroxide at 70-90° ... 

The reaction of isocyanogen tetrabromide with benzenesulfinate produces a tetrasulfone, which is readily oxidized to bis(phenylsulfonyl)diazo-methane... 

Carbon tetrabromide. Carbon tetrachloride. Chloroform 3 See methane, tetrabromo-See methane, tetrachloro- 0.00005 0.000577 - 0.49 -4.17... 

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