bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Synthesis and Biological Evaluation of Novel 2‐Aralkyl‐5‐substituted‐6‐(4′‐fluorophenyl)‐imidazo[2,1‐b] [1,3,4]thiadiazole Derivatives as Potent Anticancer Agents.
Authors: Karki Subhas S. , Panjamurthy Kuppusamy , Kumar Sujeet , Nambiar Mridula , Ramareddy Sureshbabu A. , Chiruvella Kishore K. , Raghavan Sathees C. 
Published: August 2011

AbstractThe compounds (I), (III), (V), and (VI) are screened for their biological activity on leukemia cells.
ChemInform Abstract: Palladium‐Catalyzed Cascade Reactions of Coumarins with Alkynes: Synthesis of Highly Substituted Cyclopentadiene Fused Chromones.
Authors: Wang Lei , Peng Shiyong , Wang Jian 
Published: August 2011

AbstractAn unprecedented Pd‐catalyzed cascade reaction between coumarins and alkynes furnishing highly substituted cyclopentadiene fused chromones is developed.
ChemInform Abstract: Highly Asymmetric NHC‐Catalyzed Hydroacylation of Unactivated Alkenes.
Authors: Piel Isabel , Steinmetz Marc , Hirano Keiichi , Froehlich Roland , Grimme Stefan , Glorius Frank 
Published: August 2011

AbstractThe title reaction produces 21 different chroman‐4‐one‐type products mostly with 99% e.e., each containing a newly formed quaternary stereocenter.
ChemInform Abstract: Hydroxyl‐Directed C—H Carbonylation Enabled by Mono‐N‐Protected Amino Acid Ligands: An Expedient Route to 1‐Isochromanones.
Authors: Lu Yi , Leow Dasheng , Wang Xisheng , Engle Keary M. , Yu Jin‐Quan 
Published: August 2011

AbstractPhenethyl alcohol derivatives (I) and (IV) undergo a C—H carbonylation reaction under Pd(II) catalysis in the presence of protected amino acids as ligands.
ChemInform Abstract: Triethylammonium Acetate [TEAA]: An Efficient Catalyst for One Pot Synthesis of Tetrahydro‐4H‐chromene Derivatives.
Authors: Balaskar Ravi , Gavade Sandip , Mane Madhav , Pabrekar Pramod , Shingare Murlidhar , Mane Dhananjay 
Published: August 2011

AbstractBest results are obtained in the absence of any additional solvent.
ChemInform Abstract: Three‐Component Synthesis of Cyclic Enaminones via Ketene Cyclization.
Authors: Seki Hajime , Georg Gunda I. 
Published: August 2011

AbstractAza‐Michael addition, Wolff rearrangement and a nucleophilic ketene cyclization lead to highly functionalized six‐membered enaminone subunits in a one‐pot reaction.
ChemInform Abstract: Synthesis of a New Heterocyclic System, 1‐Halomethyl‐2‐oxa‐5‐azoniaspiro[4.5]decane Halides
Authors: Kim D. G. , Frolov A. L. 
Published: August 2011

Abstractvia reaction of 1‐(2‐vinyloxy)ethylpiperidine (I) with bromine or iodine
ChemInform Abstract: Palladium‐Catalyzed Cycloisomerizations of (Z)‐1‐Iodo‐1,6‐dienes: Iodine Atom Transfer and Mechanistic Insight to Alkyl Iodide Reductive Elimination.
Authors: Liu Hui , Li Chaolong , Qiu Dong , Tong Xiaofeng 
Published: August 2011

AbstractThe cycloisomerization of (Z)‐iododienes ‐ consisting of an oxidative addition of vinyl iodide, alkene insertion, and alkyl iodide reductive elimination ‐ gives a facile entry to tetrahydropyridines with a quaternary carbon center.
ChemInform Abstract: Mn(III)‐Mediated Formal [3 + 3]‐Annulation of Vinyl Azides and Cyclopropanols: A Divergent Synthesis of Azaheterocycles.
Authors: Wang Yi‐Feng , Toh Kah Kah , Ng Eileen Pei Jian , Chiba Shunsuke 
Published: August 2011

AbstractA divergent synthetic route to azaheterocycles from readily available vinyl azides and cyclopropanols via formal [3 + 3] annulation using Mn(III) complexes is developed.
ChemInform Abstract: Radical Cyclization of Ynamides into Six‐ or Eight‐Membered Rings. Application to the Synthesis of a Protoberberine Analogue.
Authors: Balieu Sebastien , Toutah Krimo , Carro Laura , Chamoreau Lise‐Marie , Rousseliere Helene , Courillon Christine 
Published: August 2011

AbstractRadical 6‐exo‐dig cyclization of ynamide (I) is followed by migration of the acetyl moiety to give isoquinoline derivative (II).
ChemInform Abstract: Heterocyclization of N,N′‐Disubstituted p‐Phenylenediamines with Cyclic β‐Diketones and Formaldehyde. Synthesis of New Pyrido[2,3‐g]quinoline Derivatives.
Authors: Kadutskii A. P. , Kozlov N. G. , Zhikharko Yu. D. 
Published: August 2011

AbstractDispiro derivatives of pyrido[2,3‐g]quinoline (IV) are selectively obtained in a three component condensation of diamines (I) with cyclic β‐diketones and formaldehyde under mild conditions.
ChemInform Abstract: An Efficient Friedlander Condensation Using Zr(OH)2CO3·ZrO2 as Catalyst in the Solid State.
Authors: Mogilaiah K. , Swamy T. Kumara , Chandra A. Vinay 
Published: August 2011

Abstract1,8‐Naphthyridines (III) are conveniently prepared by simple grinding of 2‐amino‐nicotinaldehyde with various β‐carbonyl compounds in the presence of zirconium basic carbonate as catalyst.
ChemInform Abstract: Solvent‐Free Biginelli Reaction: A Green Method for the Synthesis of 3,4‐Dihydropyrimidin‐2‐ones Catalyzed by Protic Acids in Large‐Scale.
Authors: Wang Yangyun , Yu Jipan , Yang Haohao , Miao Zhiwei , Chen Ruyu 
Published: August 2011

AbstractAn environmentally benign Biginelli reaction using aqueous HCl as catalyst is reported.
ChemInform Abstract: Copper‐Catalyzed Cascade Synthesis of Benzimidazoquinazoline Derivatives under Mild Condition.
Authors: Xu Shan , Lu Juyou , Fu Hua 
Published: August 2011

Abstract2‐Halophenylbenzoimidazoles (I)/(IV) undergo a cascade reaction with amidines or guanidine (II).
ChemInform Abstract: An Efficient Protocol for the Synthesis of 2‐Phenylquinazolines Catalyzed by Ceric Ammonium Nitrate (CAN)
Authors: Karnakar K. , Shankar J. , Murthy S. Narayana , Ramesh K. , Nageswar Y. V. D. 
Published: August 2011

Abstract20 derivatives as possible biologically active agents
ChemInform Abstract: Synthesis of Pyrrolo[1,2‐a]quinoxalines via Gold(I)‐Mediated Cascade Reactions.
Authors: Liu Guannan , Zhou Yu , Lin Daizong , Wang Jinfang , Zhang Lei , Jiang Hualiang , Liu Hong 
Published: August 2011

AbstractTandem hydroamination and hydroarylation reaction of pyrrole‐ and indole‐substituted anilines with terminal and internal alkynes affords a wide range of three‐ and tetracyclic products.
ChemInform Abstract: Synthesis of 5‐Halo‐4H‐1,3‐oxazine‐6‐amines by a Copper‐Mediated Domino Reaction.
Authors: Hashmi A. Stephen K. , Schuster Andreas M. , Zimmer Marc , Rominger Frank 
Published: August 2011

AbstractThis method allows the synthesis of a new class of oxazine derivatives which are interesting building blocks for the synthesis of other aminooxazine derivatives.
ChemInform Abstract: Synthesis of Saturated 1,4‐Benzodiazepines via Pd‐Catalyzed Carboamination Reactions.
Authors: Neukom Joshua D. , Aquino Alvin S. , Wolfe John P. 
Published: August 2011

AbstractSubstrates such as (IV) and (VII) bearing an allylic methyl group are converted into cis‐disubstituted products (<90% d.e.).
ChemInform Abstract: General Copper‐Catalyzed Transformations of Functional Groups from Arylboronic Acids in Water.
Authors: Yang Haijun , Li Yong , Jiang Min , Wang Junmei , Fu Hua 
Published: August 2011

AbstractA simple and general copper‐catalyzed method for the synthesis of aryl iodides, aryl azides, aryl sulfones, phenols, arylamines and nitroarenes from arylboronic acids.
ChemInform Abstract: Highly Enantioselective Addition of Trimethylsilylacetylene to Aldehydes Catalyzed by a Zinc—Amino‐Alcohol Complex.
Authors: Li Zhi‐Yuan , Wang Min , Bian Qing‐Hua , Zheng Bing , Mao Jian‐You , Li Shuo‐Ning , Liu Shang‐Zhong , Wang Ming‐An , Zhong Jiang‐Chun , Guo Hong‐Chao 
Published: August 2011

AbstractThe method can be applied to aromatic, aliphatic, and α,β‐unsaturated aldehydes to give the corresponding propargylic alcohols.
ChemInform Abstract: Radical Alkylphosphanylation of Olefins with Stannylated or Silylated Phosphanes and Alkyl Iodides.
Authors: Lamas Marie‐Celine , Studer Armido 
Published: August 2011

AbstractContrary to the iodide, cyclohexyl bromide does not work and a primary alkyl moiety provides only low yields [cf.(IVc)].
ChemInform Abstract: To Stay as Allene or Go Further? Synthesis of Novel Phosphono‐heterocycles and Polycyclics via Propargyl Alcohols.
Authors: Srinivas Venu , Sajna K. V. , Swamy K. C. Kumara 
Published: August 2011

AbstractReaction behavior of aryl‐substituted propargyl alcohols upon reaction with P(III)‐Cl precursors such as (II) is studied.
ChemInform Abstract: Copper‐Catalyzed C—P Coupling Through Decarboxylation.
Authors: Hu Jie , Zhao Ning , Yang Bin , Wang Ge , Guo Li‐Na , Liang Yong‐Min , Yang Shang‐Dong 
Published: August 2011

AbstractA versatile protocol for preparation of various di(phenyl)phosphoryl oxides is developed by copper‐catalyzed decarboxylative coupling of alkenyl, alkynyl carboxylic acids, and N‐benzylproline, respectively, with R2P(O)H.
ChemInform Abstract: Practical Synthesis of N‐Boc‐ and N‐Cbz‐α‐Amido Stannanes from α‐Amido Sulfones Using TMSSnBu3 and CsF.
Authors: Mita Tsuyoshi , Higuchi Yuki , Sato Yoshihiro 
Published: August 2011

AbstractThe preparation of the synthetically important intermediates proceeds under milder conditions and tolerates more substituents than previous methods which used organometallic stannides.
ChemInform Abstract: Phragmalin‐Type Limonoid Orthoesters from the Twigs of Swietenia macrophylla
Authors: Lin Bing‐Dong , Zhang Chuan‐Rui , Yang Sheng‐Ping , Wu Yan , Yue Jian‐Min 
Published: August 2011

Abstractisolation, structure elucidation and antimicrobial activities of eleven new phragmalin‐type limonoids, swietenitins N—X, such as (I) and (II)
ChemInform Abstract: Cyclic Dipeptides: Catalyst/Promoter‐Free, Rapid and Environmentally Benign Cyclization of Free Amino Acids.
Authors: Nonappa Nonappa , Ahonen Kari , Lahtinen Manu , Kolehmainen Erkki 
Published: August 2011

AbstractThe presented synthesis of the title compounds (II), (IV), (VI) and (VIII) is extremely simple and highly efficient without the use of any chromatographic purification.
ChemInform Abstract: 2,3‐Dideoxy Hex‐2‐enopyranosid‐4‐uloses as Promising New Antitubercular Agents: Design, Synthesis, Biological Evaluation and SAR Studies.
Authors: Srivastava Ranjana , et al. et al. 
Published: August 2011

AbstractA detailed SAR study identifies S007—724 (I) as a promising lead molecule on the basis of low MIC values (0.78 μg/mL ‐ M.
ChemInform Abstract: Resveratrol Derivatives from Vatica albiramis
Authors: Abe Naohito , Ito Tetsuro , Oyama Masayoshi , Sawa Ryuichi , Takahashi Yoshikazu , Iinuma Munekazu 
Published: August 2011

Abstractstructure determination of a new resveratrol hexamer, albiraminol A (I) and two new resveratrol dimers, albiraminol B (II) and vatalbinoside F (III)
ChemInform Abstract: Synthetic Studies on Natural Products. Part. 33. An Efficient Stereoselective Total Synthesis of Aculeatins A and B.
Authors: Das Biswanath , Krishnaiah Martha , Nagendra Siddavatam , Reddy Cheruku R. 
Published: August 2011

AbstractA synthetic route to naturally occurring aculeatins A (XI) and B (XII) is developed.
ChemInform Abstract: Bafilomycin K, a New Antifungal Macrolide from Streptomyces flavotricini Y12‐26.
Authors: Zhang Dao‐jing , Wei Gang , Wang Ying , Si Cong‐cong , Tian Li , Tao Li‐ming , Li Yuan‐guang 
Published: August 2011

AbstractBafilomycin K (I) exhibits antifungal activities against plant pathogens.
ChemInform Abstract: Perovskites and Their Nanocomposites with Fluorite‐Like Oxides as Materials for Solid Oxide Fuel Cells Cathodes and Oxygen‐Conducting Membranes: Mobility and Reactivity of the Surface/Bulk Oxygen as a Key Factor of Their Performance
Authors: Sadykov V. A. , Pavlova S. N. , Kharlamova T. S. , Muzykantov V. S. , Uvarov N. F. , Okhlupin Yu. S. , Ishchenko A. V. , Bobin A. S. , Mezentseva N. V. , Alikina G. M. , et al. et al. 
Published: August 2011

AbstractReview: 161 refs.
ChemInform Abstract: 1,2,3‐Triazoles in Peptidomimetic Chemistry
Authors: Pedersen Daniel Sejer , Abell Andrew 
Published: August 2011

AbstractReview: [triazoles prepared by cycloadditions reactions as both “linear” and “bent” peptidomimetics, use of triazoles to define the geometry and properties of a peptidomimetic; 83 refs.]
ChemInform Abstract: Urea/Thiourea Derivatives and Zn(II)‐DPA Complex as Receptors for Anionic Recognition — A Brief Account
Authors: Das Priyadip , Mahato Prasenjit , Ghosh Amrita , Mandal Amal K. , Banerjee Tanmay , Saha Sukdeb , Das Amitava 
Published: August 2011

AbstractReview: 68 refs.
Stereodynamics and absolute configuration of stereolabile atropisomers in 2,2‐dimethyl‐1‐aryl‐1‐indanols
Authors: Casarini Daniele , Mancinelli Michele , Mazzanti Andrea , Boschi Francesca 
Published: August 2011

AbstractWe describe herein the investigation of the stereodynamic processes occurring in a series of 1‐aryl‐2,2‐dimethylindanols, by dynamic NMR. When the aryl moiety is a mesityl or a 2‐methyl‐1‐naphthyl, the rotational barrier exceeds the 25 kcal/mol, so that stable atropisomers are observed. In two cases, all the chiral‐atropisomeric species have been separated by enantioselective HPLC, and the comparison between theoretical and experimental electronic circular dichroism spectra allowed the absolute configuration assignment of all the isolated species to be obtained. Chirality, 2011. © 2011 Wiley‐Liss, Inc.
Effects of alternating current (AC) and direct current (DC) in electrocoagulation process for the removal of iron from water
Authors: Vasudevan Subramanyan 
Published: August 2011

AbstractIn practice, direct current (DC) is used in an electrocoagulation processes. In this case, an impermeable oxide layer may form on the cathode as well as corrosion formation on the anode due to oxidation. This prevents the effective current transfer between the anode and cathode, so the efficiency of electrocoagulation processes declines. These disadvantages of DC have been diminished by adopting alternating current (AC) in electrocoagulation processes. The main objective of this study is to investigate the effects of AC and DC on the removal of iron from water using zinc as anode and cathode. The results showed that the optimum removal efficiency of 99.6% and 99.1% with the energy consumption of 0.625 and 0.991 kWh kL−1 was achieved at a current density of 0.06 A dm−2, at pH of 7.0 using AC and DC, respectively. For both AC and DC, the adsorption of iron was preferably fitting Langmuir adsorption isotherm, the adsorption process follows second order kinetics and the temperature studies showed that adsorption was exothermic and spontaneous in nature. © 2011 Canadian Society for Chemical Engineering
TIO2/Nanoclay nanocomposite for phenol degradation in sonophotocatalytic reactor
Authors: Ghodke Shailesh , Sonawane Shirish , Gaikawad Ravindra , Mohite K. C. 
Published: August 2011

AbstractA TiO2–nanoclay nanocomposite was used as a photocatalyst for the degradation of phenol in presence of acoustic cavitation. TiO2–nanoclay nanocomposite was synthesised in benzyl alcohol medium wherein TiO2 nanoparticles were formed between the nanoclay platelets. The synthesised product was characterised by using FTIR, XRD and TEM techniques. TEM image shows that TiO2–nanoclay nanocomposite particles were in the range of 30–40 nm. XRD gram confirms the formation of nanocomposite of TiO2 nanoclay. The effect of cavitation and TiO2–nanoclay nanocomposite photocatalyst on phenol removal was investigated. The effects of various parameters such as nanocomposite loading, initial concentration, etc., have been studied. On comparing the results obtained with that of nanocomposite without UV, it was found for an initial concentration of 500 mg/L of phenol, the TiO2–nanoclay nanocomposite exhibited higher percentage of pollutant removal (59%) and for nanoclay it was 47%. © 2011 Canadian Society for Chemical Engineering
Simulation of binary gas separation with asymmetric hollow fibre membranes and case studies of air separation
Authors: Kundu Prodip K. , Chakma Amit , Feng Xianshe 
Published: August 2011

AbstractA mathematical model for high‐flux asymmetric hollow fibre membrane was developed considering the effect of permeate pressure build‐up inside the fibre bore. A new solution technique was developed to solve the model equations, which constitute a boundary value problem. The ordinary differential equations were solved as an initial value problem in two successive steps using the Gear's BDF method. The technique is advantageous since it requires minimum computational time and effort with improved solution stability, and the computational complexity does not multiply as the number of components increases. The model predictions and the robustness of the numerical technique were validated with experimental data for several membrane systems with different flow configurations. The model and the solution technique were applied to evaluate the separation characteristics of air using representative membranes with different configurations, including single‐stage, single‐stage with permeate recycle, single‐stage with retentate recycle, air blending, and two stages in series. The study demonstrates that the new solution technique can conveniently handle the high‐flux hollow fibre membrane problems with different module configurations. © 2011 Canadian Society for Chemical Engineering
On the transition stage of bubble formation on the orifice of a submerged vertical nozzle
Authors: Lee Shong‐Leih , Yang Chao‐Fu 
Published: August 2011

AbstractThe transition stage (self‐accelerating necking process) generally takes place before a bubble collapses. However, the mechanism is still not well understood. In this article, seven existing experiments dealing with bubble formation on the orifice of a submerged vertical nozzle are examined by solving the Young–Laplace equation. Multiple solution modes are found. Bubble in solution mode 2 has a neck and thus taller than mode 1 at the same volume. The present numerical result along with an experiment from Longuet‐Higgins et al. [J. Fluid Mech. 230, 365–390 (1991)] evidences an isometric transition from solution modes 1 to 2. This might account for the self‐accelerating necking process before a bubble collapses. Surprisingly, all of the seven existing experiments agree excellently with the bubble shapes from the Young–Laplace equation without the dynamic effect even when the bubble growth rate in the experiment is 2.25 times as large as the critical value. The gas flow rate (the dynamic effect) seems to play a role only after the transition stage. © 2011 Canadian Society for Chemical Engineering
Genealogy of extremal particles of branching Brownian motion
Authors: Arguin L.‐P. , Bovier A. , Kistler N. 
Published: August 2011

AbstractBranching Brownian motion describes a system of particles that diffuse in space and split into offspring according to a certain random mechanism. By virtue of the groundbreaking work by M. Bramson on the convergence of solutions of the Fisher‐KPP equation to traveling waves, the law of the rightmost particle in the limit of large times is rather well understood. In this work, we address the full statistics of the extremal particles (first‐, second‐, third‐largest, etc.). In particular, we prove that in the large t‐limit, such particles descend with overwhelming probability from ancestors having split either within a distance of order 1 from time 0, or within a distance of order 1 from time t. The approach relies on characterizing, up to a certain level of precision, the paths of the extremal particles. As a byproduct, a heuristic picture of branching Brownian motion “at the edge” emerges, which sheds light on the still unknown limiting extremal process. © 2011 Wiley Periodicals, Inc.
Improved breakdown criterion for einstein vacuum equations in CMC gauge
Authors: Wang Qian 
Published: August 2011

AbstractLet
${\cal M}_*$ = ∪ Σt be a part of vacuum globally hyperbolic space‐time (M, g), foliated by constant mean curvature hypersurfaces Σt with t0 < t* < 0. We improve the existing breakdown criteria for Einstein vacuum equations by showing that the foliation can be extended beyond t* provided the second fundamental form k and the lapse function n satisfy the weaker condition

The proof of this result %in particular relies on the second main result of the paper, which gives a uniform lower bound on the null radius of injectivity. © 2011 Wiley Periodicals, Inc.
Phosphorescence Energies of Organic Light‐Emitting Diodes from Spin‐Flip Tamm–Dancoff Approximation Time‐Dependent Density Functional Theory
Authors: Kühn Michael , Weigend Florian 
Published: August 2011

AbstractThe phosphorescence energy in organometallic transition‐metal compounds relevant for organic light‐emitting diodes is calculated using spin‐flip time‐dependent density functional theory within the Tamm–Dancoff approximation, a technique presented by Wang and Ziegler. This method is implemented in the TURBOMOLE program suite by modifications of the present code. The predictions of the triplet–singlet transition energies with the spin‐flip approach using functionals of the local density approximation are significantly more stable than those obtained from the indirect calculation as singlet–triplet excitation with conventional time‐dependent density functional theory. They are also more stable than those of Δ‐SCF, even if more sophisticated generalized gradient or hybrid functionals are used for the latter.
In Situ Synchrotron Radiation X‐Ray Microspectroscopy of Polymer Microcontainers
Authors: Graf‐Zeiler Birgit , Fink Rainer H. , Tzvetkov George 
Published: August 2011

AbstractDirect, real‐time analytical techniques that provide high‐resolution information on the chemical composition and submicrometer structure of various polymer micro‐ and nanoparticles are in high demand in a range of life science disciplines. Synchrotron‐based scanning transmission X‐ray microspectroscopy (STXM) combines both local‐spot chemical information (assessed via near‐edge X‐ray absorption fine structure spectroscopy) and imaging with resolution of several tens of nanometers, and thus can yield new insights into the nanoscale properties of these materials. Furthermore, this method allows in situ examination of soft‐matter samples in aqueous/gaseous environments and under external stimuli, such as temperature, pressure, ultrasound, and light irradiation. This Minireview highlights some recent progress in the application of the STXM technique to study the temperature‐dependent behavior of polymer core–shell microcapsules and to characterize the physicochemical properties of the supporting shells of gas‐filled microbubbles in their natural hydrated state.
Optical measurement of electric field distributions with time in propylene carbonate
Authors: Ihori Haruo , Ninomiya Sei , Fujii Masaharu 
Published: August 2011

AbstractElectrical insulation diagnosis requires that we obtain information about the electric field distribution and the space charge distribution in insulating materials. We have measured nonuniform electric field vector distributions in liquid dielectrics by our original method based on the electrooptic Kerr effect and the CT method. We carried out time sequence measurement of the electric field vector distribution in propylene carbonate, which is a dielectric liquid. When a DC voltage pulse of 200‐ms width was applied to a parallel plane electrode system, the electric field vector distributions, which had the shape of a circle 12 mm in diameter, were measured at time intervals of 3 ms. The measurements were carried out while varying the conductivity of the liquid. The distribution a certain time after applying the voltage pulse seemed to be disturbed. Observation of the time at which the disturbance started would make it possible to determine the behavior and electrical characteristics of the liquid. We also studied the evaluation of remnant charges. © 2011 Wiley Periodicals, Inc. Electron Comm Jpn, 94(9): 45–51, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.10351