Showing papers on "Boron tribromide published in 1968"
TL;DR: The use of boron tribromide for effecting complete demethylation of aryl methyl ethers at, or below, room temperature was described in this article.
477 citations
TL;DR: In this article, the reactions of monosilylarsine with diborane, monobromodiboranes, boron trichloride, and tricon tribromide are discussed together with a mechanism for this condensation.
Abstract: The reactions of monosilylarsine with diborane, monobromodiborane, boron trichloride, and boron tribromide are discussed together with the reaction of monosilylphosphine with boron tribromide Definite adducts are formed in all the reactions except that of diborane in which condensation to trisilyarsine occurs A mechanism is suggested for this condensation and for the apparently anomalous reactions with boron tribromide
7 citations
6 citations
TL;DR: In this paper, the reaction of dinitroaniline and dinitronaphthylamine with the acetonitrile adducts of boron trichloride and borón tribromide and compared with thermodynamic data on the dissociation energies of N-B and B-X bonds in the adduct, the bimolecular pattern of substitution is observed for chloride, but for bromide, the reaction is near to the borderline with unimolecular substitution.
Abstract: Kinetic parameters for the reaction of dinitroaniline and dinitronaphthylamine with the acetonitrile adducts of boron trichloride and boron tribromide in acetonitrile have been obtained and compared with thermodynamic data on the dissociation energies of N–B and B–X bonds in the adducts. The bimolecular pattern of substitution is observed for chloride, but for bromide, the reaction is near to the borderline with unimolecular substitution, although still exhibiting a rate dependence on nucleophile. The thermodynamic data show that boron trichloride and boron tribromide are approximately equal in Lewis acid strength in acetonitrile as solvent and reference base, contrary to expectation.
2 citations
TL;DR: In this article, the anisotropic electron polarisabilities of isolated boron trichloride, trifluoride, and tribromide molecules were derived from the measurements in cyclohexane and resolved to yield the appropriate borson (sp2)-halogen bond parameters.
Abstract: Molar Kerr constants are reported for boron trichloride and boron tribromide in cyclohexane and for boron trifluoride and boron trichloride in dioxan. The anisotropic electron polarisabilities of the ‘isolated’ boron trichloride and boron tribromide molecules are derived from the measurements in cyclohexane and resolved to yield the appropriate boron (sp2)–halogen bond parameters. Polarity and polarisability changes arising from complex formation of the boron trihalides with dioxan are discussed.
1 citations