The crystal structures of 1-(polyfluorophenylmethyl)-3-methylimidazolium bromide salts
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Hydrogen bromide
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Bromide promoted decomposition of tert-butyl bromide in the presence of triphenylphosphine gives, besides isobutene, hydrogen(triphenyl)phosphonium bromide. When heated to approximately 150°C in the presence of xylene, the latter salt liberates hydrogen bromide which may then be trapped in an aprotic solvent such as diethyl ether.
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새로운 산성 이온용액인1-(${\omega}$ -sulfonicacid)propyl-3-methylimidazolium bromide ([$HSO_3$ pmim]Br)과 1-(${\omega}$ -sulfonicacid)-butyl-3-methylimidazolium bromide([$HSO_3$ bmim]Br)을 제조하였다. 이 화합물들을 브롬화 시약 및 용매로 사용하여 $100^{\circ}C$ , 2시간 반응시켰으며, 간단히 상분리에 의해 1,7-dibromoheptane을 95% 수율로 합성하였다. 이 산성 이온용액을 5회 재사용하였으나 수율 감소가 관찰되지 않았다. Novel acidic ionic liquids, 1-(${\omega}$ -sulfonicacid)propyl-3-methylimidazolium bromide ([$HSO_3$ pmim]Br)and 1-(${\omega}$ -sulfonicacid)butyl-3-methylimidazolium bromide ([$HSO_3$ bmim]Br), were prepared and used as brominating agents, catalysts and solvents in the synthesis of 1,7-dibromoheptane, respectively. 1,7-dibromoheptan with a yield of 95% was obtained at $100^{\circ}C$ for 2 h by simple phase separation. The acidic ionic liquid [$HSO_3$ pmim]Br was recycled for 5 times and the yield of 1,7-dibromoheptane did not decrease remarkably, which indicates that catalysts still maintain good selectivity and activity after recycling. The structure of the acidic ionic liquid [$HSO_3$ pmim]Br was characterized with IR, and it was found that [$HSO_3$ pmim]Br had stronger acidity than other ionic liquid.
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17β-Acetoxy-androstane derivatives containing two potential sites of unsaturation in rings A and B undergo rearrangement to anthrasteroids on treatment with acetyl bromide and hydrogen bromide generated in situ from acetyl bromide and propan-2-ol.
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The solubilities of hydrogen bromide and methyl bromide in nitrobenzene and in 1,2,4-trichlorobenzene have been measured in the presence and absence of gallium bromide. When gallium bromide does not exist in the system, the solubilities of HBr and MeBr in nitrobenzene are greater than in 1,2,4-trichlorobenzene, indicating the greater basicity of nitrobenzene than 1,2,4-trichlorobenzene. When there exists gallium bromide in the system, the addition compounds, GaBr3·HBr and GaBr3·CH3Br, have been found to exist in solution. The addition compound of GaBr3·HBr is stable in nitrobenzene but unstable in 1,2,4-trichlorobenzene. On the other hand the addition compound of is unstable in both solvents. All of these unstable addition compounds dissociate into components to large extents according to one of the following equilibria or both: $.$ where R denotes either hydrogen atom or methyl group.
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Six kinds of ionic liquids 1-alkyl-3-methylimidazolium bromides were synthesized from N-methylimidazolium and alkyl bromides with microwave irradiation.The ionic liquids investigated here were 1-n-propyl-3-methylimidazolium bromide,and 1-iso-propyl-3-methylimidazolium bromide,1-n-butyl-3-methylimidazolium bromide,1-sec-butyl-3-methylimidazolium bromide,1-n-amyl-3-methylimidazolium bromide,and 1-n-hexyl-3-methylimidazolium bromide.1-n-butyl-3-methylimidazolium bromide was converted into 1-n-butyl-3-methylimidazolium tetrafluoroborate after anionic exchanging.Density of ionic liquids was measured at 25 ℃.The results showed that density of ionic liquids with same anion decreased as the length of the alkyl chain on the cation increased.For a given cation,the density increased as the volume of the anion increased.Cyclic voltammograms study revealed that the potential windows of 1-n-butyl-3-methylimidazolium bromide and 1-n-butyl-3-methylimidazolium tetrafluoroborate were 2.0 V and 3.4 V,respectively.DSC curve of 1-n-butyl-3-methylimidazolium tetrafluoroborate showed that it had glass-transition temperature(-95 ℃) and had not crystallization and melting temperatures.
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange Reactions of Gallium Bromide with Hydrogen Bromide and with Methyl Bromide in 1,2,4-Trichlorobenzene and in Nitrobenzene1Sang Up Choi and John E. WillardCite this: J. Am. Chem. Soc. 1965, 87, 14, 3072–3076Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published inissue 1 July 1965https://pubs.acs.org/doi/10.1021/ja01092a010https://doi.org/10.1021/ja01092a010research-articleACS PublicationsRequest reuse permissionsArticle Views80Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Nitrobenzene
Hydrogen bromide
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Thermolysis of triphenylphosphonium bromide in refluxing xylene provides quantitative yield of anhydrous hydrogen bromide.
Hydrogen bromide
Anhydrous
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