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433 Newest Publications about the topic bromine
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Prediction of Clathrate Structure Type and Guest Position by Molecular Mechanics
03-05-2013 | Everly B. Fleischer; Kenneth C. Janda, Journal of Physical Chemistry A, 2013
The clathrate hydrates occur in various types in which the number, size, and shape of the various cages differ. Usually the clathrate type of a specific guest is predicted by the size and shape of the molecular guest. We have developed a methodology to determine the clathrate type employing ...
Nucleophile-Dependent Regioselective Reaction of (S)-4-Benzyl-2-Fluoroalkyl-1,3-Oxazolines
19-04-2013 | Haizhen Jiang; Liuming Yan; Minjun Xu; Wenjun Lu; Yeshan Cai; Wen Wan; Jianhua Yao; Shaoxiong Wu; Shizheng Zhu; Jian Hao, The Journal of Organic Chemistry, 2013
Nucleophile-dependent regioselectivities in the nucleophilic reaction of (S)-4-benzyl-2-fluoroalkyl-1,3-oxazoline to different types of fluorinated compounds were investigated experimentally and theoretically. The ring opening of (S)-4-benzyl-2-bromodifluoromethyl-1,3-oxazoline by ...
The relationship between end‐group concentrations and stability of spin‐coated thin polymer films investigated by ToF‐SIMS depth profiling
18-04-2013 | Xianwen Ren, Lu‐Tao Weng, Chi‐Ming Chan, Kai‐Mo Ng, Surface and Interface Analysis, 2013
Stable and unstable spin‐coated polymer films were prepared using various solvents and substrates. The relationship between polymer end‐group concentrations and stability of spin‐coated polymer films was revealed by time‐of‐flight secondary ion mass spectrometry depth profiling. A high ...
Efficient Hydroxymethylation Reactions of Iodoarenes Using CO and 1,3-Dimethylimidazol-2-ylidene Borane
16-04-2013 | Takuji Kawamoto; Takuma Okada; Dennis P. Curran; Ilhyong Ryu, Organic Letters, 2013
A hydroxymethylation reaction of a variety of iodoarenes proceeded effectively in the presence of CO, NHC-borane, diMeImd-BH3 (2) as a radical mediator, and a catalytic amount of AIBN. The reaction took place chemoselectively at the aryl-iodine bond but not at the aryl-bromine and ...
Alkaline Stable C2-Substituted Imidazolium-Based Anion-Exchange Membranes
12-04-2013 | Bencai Lin; Huilong Dong; Youyong Li; Zhihong Si; Fenglou Gu; Feng Yan, Chemistry of Materials, 2013
The alkaline stability of imidazolium salts and imidazolium-based alkaline anion-exchange membranes (AEMs) was investigated in this work. C2-substituted (with methyl, isopropyl or phenyl groups) imidazolium salts, 3-ethyl-1,2-dimethyl imidazolium bromine ([EDMIm][Br]), ...
A novel derivatization reagent possessing a bromoquinolinium structure for biological carboxylic acids in HPLC‐ESI‐MS/MS
09-04-2013 | Yuko Mochizuki, Shinsuke Inagaki, Mayu Suzuki, Jun Zhe Min, Koichi Inoue, Kenichiro Todoroki, Toshimasa Toyo'oka, Journal of Separation Science, 2013
A novel bromoquinolinium reagent, i.e., 1‐(3‐aminopropyl)‐3‐bromoquinolinium bromide (APBQ), was synthesized for the analysis of carboxylic acids. A simple and practical pre‐column derivatization procedure using the APBQ in reversed‐phase chromatography and mass spectrometry (HPLC‐MS) has ...
Bromine kinetic isotope effect: insight into the Grignard reagent formation
03-04-2013 | Faina Gelman; Lukasz Szatkowsky; Agnieszka Dybala-Defratyka; Charlie Batarseh; Jochanan Blum, New Journal of Chemistry, 2013
The study focuses on the determination of bromine kinetic isotope effect (Br-KIE) on Grignard reagent formation applying compound specific bromine isotope analysis. Clear difference between the Br-KIE values for aromatic and aliphatic bromides was observed. The measured Br-KIE values were ...
Correction for Isotopic Interferences between Analyte and Internal Standard in Quantitative Mass Spectrometry by a Nonlinear Calibration Function
29-03-2013 | Geoffrey S. Rule; Zlatuse D. Clark; Bingfang Yue; Alan L. Rockwood, Analytical Chemistry, 2013
Stable isotope-labeled internal standards are of great utility in providing accurate quantitation in mass spectrometry (MS). An implicit assumption has been that there is no “cross talk” between signals of the internal standard and the target analyte. In some cases, however, naturally ...
Photoexcitation of 2-bromo-2-chloro-1,1,1-trifluoroethane (halothane) to repulsive surface nσ∗(C–Br) at 234 nm: Dynamics of C–Br and C–Cl bond rupture
25-03-2013 | Chemical Physics, 2013
18 April 2013 Publication year: 2013Source:Chemical Physics, Volume 416 The photodissociation dynamics of 2-bromo-2-chloro-1,1,1-trifluoroethane (halothane) have been studied near 234nm, in a molecular beam environment, employing resonance-enhanced multiphoton ionization with ...
Halogen Bonds: Benchmarks and Theoretical Analysis
25-03-2013 | Sebastian Kozuch; Jan M. L. Martin, Journal of Chemical Theory and Computation, 2013
We carried out an extensive survey of wave function and DFT methods to test their accuracy on geometries and dissociation energies of halogen bonds (XB). For that purpose, we built two benchmark sets (XB18 and XB51). Between the DFT methods, it was found that functionals with high exact ...
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