bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of La, Ce, and Y Oxides on SnO2 Catalysts for CO and CH4 Oxidation
Authors: Xu Xianglan , Zhang Rongbin , Zeng Xianrong , Han Xue , Li Yucheng , Liu Yang , Wang Xiang 
Published: March 2013

AbstractSnO2‐based catalysts modified by La, Ce, and Y with a Sn/Ln (Ln=La, Ce, Y) atomic ratio of 2:1 were prepared by using a co‐precipitation method and used for CO and CH4 oxidation. The catalysts were characterized by N2 adsorption–desorption, XRD, energy dispersive X‐ray spectroscopy (EDS)‐SEM, H2 temperature‐programmed reduction (TPR), X‐ray photoelectron spectroscopy (XPS), and thermogravimetric analysis differential scanning calorimetry (TGA‐DSC) techniques. All three rare earth metal oxides were found to improve the thermal stability of SnO2, which resulted in catalysts with much higher surface areas and smaller crystallite and particle sizes. However, only the addition of Ce resulted in a catalyst with improved activity for both CO and CH4 oxidation. In contrast, La and Y modification resulted in samples with decreased activity for both reactions. For the Ce‐modified sample, Ce cations were found to dope into the lattice of rutile SnO2 to form a solid‐solution structure. As a lattice impurity, ceria, the well‐known oxygen storage component (OSC), led to the formation of more defects in the matrix of SnO2 and impeded the crystallization process, which resulted in a catalyst with a higher surface area and more active oxygen species. In contrast, XRD proved that the addition of La and Y mainly led to the formation of more stable and inert pyrochlore compounds, Sn2La2O7 and Sn2Y2O7, which disrupted a major part of the active sites based on SnO2. Consequently, the oxidation activity was impaired, although these two samples also have higher surface areas than pure SnO2. The Ce‐modified sample showed not only high activity but also good reaction durability and thermal stability. Furthermore, Sn‐Ce binary oxide is a better support than SnO2, CeO2, and traditional Al2O3 supports for Pd, which gives it the potential to be applied in some real after‐treatment applications.
Palladium‐Catalysed Regioselective Direct Arylations of Heteroarenes by Bromobenzamides: Direct Synthesis of Heteroaryl Benzamides
Authors: Chen Lu , Bruneau Christian , Dixneuf Pierre H. , Doucet Henri 
Published: March 2013

AbstractThe Pd‐catalysed direct arylation of heteroarene CH bonds by 2‐ or 4‐bromobenzamides has been achieved. In the presence of KOAc as the base, no CN bond formation or CC coupling of two bromobenzamides was observed. Both primary and tertiary amides can be employed for CC cross‐coupling of 4‐bromobenzamides with a variety of heteroarenes to give the C5‐arylated heteroarenes in good yields by using a low loading (0.5 mol %) of Pd(OAc)2 catalyst. However, no coupling product was observed with 2‐bromobenzamide, and a moderate reactivity of 2‐bromo‐N,N‐diethylbenzamide has been observed with 2 mol % PdCl(C3H5)(dppb) (dppb=1,4‐bis(diphenylphosphino)butane) as the catalyst. A moderate influence due to the nature of the heteroarene was observed, and thiazoles, thiophenes, furans and pyrroles have been arylated successfully. The reaction of a thiazole with 2‐bromo‐N‐phenylbenzamide led to a six‐membered ring product by intramolecular cyclisation, whereas a 2‐bromo‐N‐benzylbenzamide gave the desired intermolecular coupling product.
Reversible Phase Transfer of Luminescent ZnO Quantum Dots between Polar and Nonpolar Media
Authors: Zhang Chengbo , Li Keyan , Song Shuyan , Xue Dongfeng 
Published: March 2013

AbstractA facile and reversible phase‐transfer protocol for luminescent ZnO quantum dots (QDs) between methanol and hexane is presented. Oleylamine together with acetic acid trigger this reversible phase‐transfer process, during which the structure and optical properties of the ZnO QDs are well‐protected. ZnO QDs with a diameter of approximately 5 nm emit yellow light at 525 nm, while those with a diameter of approximately 4 nm emit green light at 510 nm. The positions of the emission peaks remain unchanged during the presented phase‐transfer process. The Pearson’s hard and soft (Lewis) acid and base principle, together with the principle that similar substances are more likely to be dissolved by each other, describes the current reversible phase‐transfer process. Herein, we circumvent the time‐consuming work required to synthesize ZnO QDs in different environments, making it possible to combine the advantages of ZnO QDs dispersed in polar and nonpolar solvents.
The Aza‐Morita–Baylis–Hillman Reaction: A Mechanistic and Kinetic Study
Authors: Lindner Christoph , Liu Yinghao , Karaghiosoff Konstantin , Maryasin Boris , Zipse Hendrik 
Published: March 2013

AbstractThe aza‐Morita‐Baylis–Hillman (aza‐MBH) reaction has been studied in a variety of solvents, a selection of imine substrates and with various combinations of PPh3 and para‐nitrophenol as the catalyst system. The measured kinetic data indicates that the effects of solvent and protic co‐catalyst are strongly interdependent. These results are most easily reconciled with a mechanistic model involving the reversible protonation of zwitterionic intermediates in the catalytic cycle, which is also supported by 31P NMR spectroscopy and quantum chemical studies.
ChemInform Abstract: Crystal Structure and Electronic Properties of the New Compound U3Fe4Ge4.
Authors: Berthebaud D. , Tougait O. , Potel M. , Lopes E. B. , Waerenborgh J. C. , Goncalves A. P. , Noel H. 
Published: March 2013

AbstractThe new title compound is obtained from a stoichiometric melt of the elements.
ChemInform Abstract: An Efficient Charge Compensated Red Phosphor Sr3WO6:K+,Eu3+ — For White LEDs.
Authors: Zhao Xin , Ding Yufeng , Li Zhaosheng , Yu Tao , Zou Zhigang 
Published: March 2013

AbstractThe title phosphor is synthesized by solid state reaction of SrCO3, K2CO3, WO3, and Eu2O3 (1100 °C, 30 h).
ChemInform Abstract: Synthesis, Structures, and Photochemistry of Tricarbonyl Metal Polyoxoanion Complexes, [X2W20O70{M(CO)3}2] 12‐ (X: Sb, Bi and M: Re, Mn).
Authors: Zhao Chongchao , Kambara Choon Sung , Yang Ye , Kaledin Alexey L. , Musaev Djamaladdin G. , Lian Tianquan , Hill Craig L. 
Published: March 2013

AbstractCompounds (IIIa,b) and (Va,b) are characterized by XRD, UV/VIS spectroscopy, and DFT calculations.
ChemInform Abstract: Acceptorless and Base‐Free Dehydrogenation of Alcohols and Amines Using Ruthenium‐Hydride Complexes.
Authors: Muthaiah Senthilkumar , Hong Soon Hyeok 
Published: March 2013

AbstractShov′s complex Ru2(CO)4(C5Ph4OH)2 shows the best activity for the oxidation of both secondary alcohols and nitrogen‐containing heterocyclic compounds amongst other tested ruthenium‐hydride complexes.
ChemInform Abstract: IF5—Pyridine—HF: Air‐ and Moisture‐Stable Fluorination Reagent.
Authors: Hara Shoji , Monoi Miki , Umemura Ryosuke , Fuse Chiaki 
Published: March 2013

AbstractThe title reagent, prepared by mixing equimolar amounts of IF5 with HF· pyridine, is found to be an efficient reagent for the desulfurative fluorination of thio compounds as well as introduction of fluorine to the α‐position of sulfides.
ChemInform Abstract: Tandem Palladium(0) and Palladium(II)‐Catalyzed Allylic Alkylation Through Complementary Redox Cycles.
Authors: Trost Barry M. , Thaisrivongs David A. , Hansmann Max M. 
Published: March 2013

AbstractThe nature of the leaving group in the first half of the tandem process is essential for the success of the second half.
ChemInform Abstract: Easily Removable Olefin Metathesis Catalysts.
Authors: Skowerski Krzysztof , Wierzbicka Celina , Szczepaniak Grzegorz , Gulajski Lukasz , Bieniek Michal , Grela Karol 
Published: March 2013

AbstractThe products of the presented reaction are purified from Ru‐residues using filtration through a small amount of silica gel or its extraction with water.
ChemInform Abstract: A Polystyrene‐Supported, Highly Recyclable Squaramide Organocatalyst for the Enantioselective Michael Addition of 1,3‐Dicarbonyl Compounds to β‐Nitrostyrenes.
Authors: Kasaplar Pinar , Riente Paola , Hartmann Caroline , Pericas Miquel A. 
Published: March 2013

AbstractA chiral squaramide supported onto a polystyrene resin is used as a very active, easily recoverable and highly reusable organocatalyst for the asymmetric Michael addition of 1,3‐dicarbonyl compounds to β‐nitrostyrenes.
ChemInform Abstract: Ruthenium Phenylindenyl Complex as an Efficient Transfer Hydrogenation Catalyst.
Authors: Manzini Simone , Urbina‐Blanco Cesar A. , Nolan Steven P. 
Published: March 2013

AbstractAn efficient and green protocol for the transfer hydrogenation of aldehydes, ketones, and imines is presented by using an inexpensive, easily synthesized, and one of the most efficient ruthenium arene transfer hydrogenation catalysts reported to date.
ChemInform Abstract: Tandem Hydroboration/Reduction of Trisubstituted β,γ‐Unsaturated Esters for the Asymmetric Synthesis of Chiral 1,3‐Diols.
Authors: Fordred Paul S. , Bull Steven D. 
Published: March 2013

AbstractHydroboration/reduction of β,γ‐unsaturated esters with (‐)‐isopinocampheylborane, followed by oxidation with alkaline hydrogen peroxide results in the formation of optically active 1,3‐diols.
ChemInform Abstract: Highly Active and Selective Synthesis of Imines from Alcohols and Amines or Nitroarenes Catalyzed by Pd/DNA in Water with Dehydrogenation.
Authors: Tang Lin , Sun Huayin , Li Yunfeng , Zha Zhenggen , Wang Zhiyong 
Published: March 2013

AbstractThe catalyst can be recovered and reused for at least five times due to its water‐soluble reversibility.
ChemInform Abstract: Rhodium‐Catalyzed Oxidative ortho‐Acylation of Aryl Ketone O‐Methyl Oximes with Aryl and Alkyl Aldehydes.
Authors: Yang Yaxi , Zhou Bing , Li Yuanchao 
Published: March 2013

AbstractThe presented title reaction is applicable to both (hetero)aryl and aliphatic aldehydes tolerating a variety of functional groups.
ChemInform Abstract: Palladium—Polypyrrole Nanoparticles‐Catalyzed Sonogashira Coupling.
Authors: Magdesieva Tatiana V. , Nikitin Oleg M. , Zolotukhina Ekaterina V. , Zinovieva Veronika A. , Vorotyntsev Mikhail A. 
Published: March 2013

AbstractPd‐Nanoparticles encapsulated into polypyrrole globules are found to be an active catalyst for the Sonogashira coupling of iodo‐ and bromoarenes.
ChemInform Abstract: Rhenium‐Catalyzed Regioselective Synthesis of 1,2‐Disubstituted Naphthalenes.
Authors: Umeda Rui , Nishi Satoru , Kojima Aya , Kaiba Kenta , Nishiyama Yutaka 
Published: March 2013

AbstractA rhenium complex‐catalyzed reaction of internal alkynes with phenylacetaldehyde dimethylacetal in the presence of stoichiometric amounts of water is reported to give low to moderate yields of 1,2‐disubstituted naphthalenes.
ChemInform Abstract: Proline Confined FAU Zeolite: Heterogeneous Hybrid Catalyst for the Synthesis of Spiroheterocycles via a Mannich Type Reaction.
Authors: Arya Kapil , Rajesh U. Chinna , Rawat Diwan Singh 
Published: March 2013

AbstractThe L‐proline confined zeolite catalyst is effective in the preparation of the novel spirocyclic pyrimidine derivatives in the three‐component condensation of lactams/cyclic ketones, amines, and formaldehyde.
ChemInform Abstract: Convenient Access to Strained Trisubstituted 2‐Azetines from Enals and Chloramine‐T in Aqueous Media.
Authors: Singh Atul K. , Chawla Ruchi , Yadav Lal Dhar S. 
Published: March 2013

AbstractKey features of this reaction are easily accessible substrates, operational simplicity, wide substrate scope and ambient temperature.
ChemInform Abstract: Cyanide as a Powerful Catalyst for Facile Preparation of 2‐Substituted Benzoxazoles via Aerobic Oxidation.
Authors: Cho Yeon Ho , Lee Chun‐Young , Ha Deok‐Chan , Cheon Cheol‐Hong 
Published: March 2013

AbstractA more efficient and scalable synthesis of benzoxazoles from the Schiff bases (I) and (III) is developed tolerating several functional groups.
ChemInform Abstract: A Facile Sequential Three‐Component Regio‐ and Stereoselective Synthesis of Novel Spiro‐isoxazoline/Acridinone Hybrids.
Authors: Maheswari Shanmugavel Uma , Perumal Subbu 
Published: March 2013

AbstractInitial Knoevenagel condensation and nitrile oxide generation are followed by 1,3‐dipolar cycloaddition to produce novel 24 title compounds as important pharmacophores.
ChemInform Abstract: Synthesis and Selective Inhibitory Activity Against Human COX‐1 of Novel 1‐(4‐Substituted‐thiazol‐2‐yl)‐3,5‐di(hetero)aryl‐pyrazoline Derivatives.
Authors: Carradori Simone , Secci Daniela , Bolasco Adriana , De Monte Celeste , Yanez Matilde 
Published: March 2013

AbstractNew pyrazoline derivatives (Vc), (Vd), (Vf)—(Vh) display promising inhibitory activities against human cyclooxygenase‐1 in the micromolar range, similar or better than the reference drugs indometacin and diclofenac.
ChemInform Abstract: Synthesis of Substituted 6H‐Benzo[c]chromenes: A Palladium‐Promoted Ring Closure of Diazonium Tetrafluoroborates.
Authors: Zhou Jing , Huang Liang‐Zhu , Li You‐Qiang , Du Zhen‐Ting 
Published: March 2013

AbstractThe extremely efficient method allows a rapid access to the biologically important heterocycle.
ChemInform Abstract: Uncatalyzed Knoevenagel Condensation of 3‐Formylchromones in Green Media: Polyethylene Glycol 400 (PEG‐400).
Authors: Suresh Suresh , Kumar Dhruva , Sandhu Jagir S. 
Published: March 2013

AbstractAn efficient, rapid, and environmentally benign Knoevenagel condensation of 3‐formylchromones with several active methylene compounds under microwave irradiation is developed.
ChemInform Abstract: An Efficient One‐Pot Organocatalytic Synthesis of 9‐(1H‐Indol‐3‐yl)‐xanthen‐4‐(9H)‐ones under Mild Aqueous Micellar Conditions.
Authors: Ganguly Nemai C. , Roy Sushmita , Mondal Pallab , Saha Rajat 
Published: March 2013

AbstractElectron‐rich indoles and N,N‐dimethylaniline are successfully coupled with o‐hydroxybenzaldehydes and dimedone in the presence of L‐proline.
ChemInform Abstract: Heterocyclization of Arylmethylidene Derivatives of Malononitrile Dimer: Synthesis of 4‐Amino‐6‐aryl‐2‐halopyridine‐3,5‐dicarbonitriles.
Authors: Bardasov Ivan N. , Mihailov Denis L. , Alekseeva Anastasiya U. , Ershov Oleg V. , Nasakin Oleg E. 
Published: March 2013

AbstractHighly functionalized pyridines are prepared via nucleophilic addition of arylmethylidene derivatives of malononitrile dimer halides to hydrogen (I) followed by cyclization and aromatization under the action of SeO2 or Br2 as the oxidizing agent.
ChemInform Abstract: New Self‐Transformation of Cyanothioacetamide in the Presence of Bases.
Authors: Dyachenko V. D. 
Published: March 2013

AbstractThe self‐transformation of cyanothioacetamide (I) in the presence of an equimolar amount of piperidine leads to the formation of 4,6‐diamino‐2‐thioxo‐1,2‐dihydropyridine‐3‐carbonitrile (II).
ChemInform Abstract: Radical Cation Salt Induced Povarov Reaction Between Iminoethyl Glyoxylate and N‐Vinylamides: Synthesis of Quinoline‐2‐carboxylate Derivatives.
Authors: Jia Xiaodong , Qing Chang , Huo Congde , Peng Fangfang , Wang Xicun 
Published: March 2013

AbstractThe process renders possible the access to target compounds of pharmaceutical interest.
ChemInform Abstract: Use of the Graeble‐Ullmann Reaction in the Synthesis of 8‐Methyl‐γ‐carboline and Isomeric Aromatic Aza‐γ‐carbolines.
Authors: Alekseev R. S. , Kurkin A. V. , Yurovskaya M. A. 
Published: March 2013

AbstractThe Graeble‐Ullmann Reaction is applied for the synthesis of various carbolines.
ChemInform Abstract: Synthesis of Novel 1,2,3,6‐Tetraazapyrene Heterocyclic System Representatives — 3,8‐Dihydropyrido[2′,3′,4′:4,5]naphtho[1,8‐de] [1,2,3]triazin‐7(6H)‐ones.
Authors: Aksenov A. V. , Aksenov N. A. , Kumshaeva A. B. , Smirnov A. N. , Nadein O. N. 
Published: March 2013

AbstractThree of the title compounds are synthesized in moderate yields by reaction of naphthotriazine (I) with β‐nitrostyrenes.
ChemInform Abstract: New Chemosensor Systems of the Benzo‐[de]isoquinoline‐1,3‐dione Series.
Authors: Tolpygin I. E. , Shepelenko E. N. , Revinskii Yu. V. , Dubonosov A. D. , Bren V. A. , Minkin V. I. 
Published: March 2013

AbstractCompounds (I) and (II) show high chemosensor selectivity in the determination of anions.
ChemInform Abstract: Organocatalytic Enantioselective Aza‐Michael Addition of Purine Bases to α,β‐Unsaturated Ketones.
Authors: Wu Hao , Tian Zhiqing , Zhang Lili , Huang Yaodong , Wang Yongmei 
Published: March 2013

AbstractThe corresponding Michael adducts are obtained in good yields and high enantioselectivities.
ChemInform Abstract: Syntheses of (4,4,5,5‐Tetramethyl‐1,3,2‐dioxaborolan‐2‐yl)arenes Through Pd‐Catalyzed Borylation of Arylbromides with the Successive Use of 2,2′‐Bis(1,3,2‐benzodioxaborole) and Pinacol.
Authors: Takagi Jun , Yamakawa Tetsu 
Published: March 2013

AbstractPalladium catalyzed borylation of aryl bromides through sequential treatment with 2,2′‐bis(1,3,2‐benzodioxaborole) and pinacol allows the synthesis of the title compounds (II) and (V).
ChemInform Abstract: Three New D‐Lactone Ring Isomeric Phragmalin‐Type Limonoids from Chukrasia tabularis var. velutina
Authors: Li Yi , Luo Jun , Wang Qiang , Kong Ling‐Yi 
Published: March 2013

Abstractisolation and structure elucidation of tabulalins G (I), H (II), and I (III)
Taking Stock of the Century‐long Utilization of the Case Method in Management Education
Authors: Mesny Anne 
Published: March 2013

AbstractOver the last century, the case method has been a key teaching tool in management education. This article takes stock of the main characteristics of the case method, clarifies its learning goals, and exposes the relationships between these goals and supporting learning theories, in particular active‐learning theory and experiential learning. It then examines the multiple variations of the case method that have developed over the years and discusses arguments against the case method. Finally, four proposals are made in view of strengthening the case method's value: extend case variety, moderate the case method's ambition to foster experiential learning, conduct empirical research about the case method's learning impacts, and emphasize the close relationship between case research and case teaching. Copyright © 2013 ASAC. Published by John Wiley & Sons, Ltd.
Electrical Plasticity and Cardioprotection in Myocardial Ischemia—Role of Selective Sodium Channel Blockers
Authors: Madonna Rosalinda , Cevik Cihan , Nasser Maher 
Published: March 2013

AbstractThe concept of electrical protection of the ischemic myocardium is in constant evolution and has recently been supported by experimental and clinical studies. Historically, antiplatelet agents, angiotensin‐converting enzyme inhibitors, β‐blockers, and statins have been all proposed as drugs conferring anti‐ischemic cardioprotection. This was supported by the evidence consistently indicating that all these drugs were capable of reducing mortality and the risk of repeat myocardial infarction. The electrical plasticity paradigm is, however, a novel concept that depicts the benefits of improved sodium channel blockade with drugs such as ranolazine and cariporide. Although it has been hypothesized that the protective role of ranolazine depends on decreased fatty acid β‐oxidation affecting preconditioning, we speculate against such a hypothesis, because inhibition of β‐oxidation requires higher concentrations of the drug, above the therapeutic range. Rather, we discuss the key role of calcium overload reduction through inhibition of the late sodium current (INa). Mechanisms driving cardioprotection involve the block of a cascade of complex ionic exchanges that can result in intracellular acidosis, excess cytosolic calcium, myocardial cellular dysfunction, and eventually cell injury and death. In this review we discuss the studies that demonstrate how electrical plasticity through sodium channel blockers can promote cardioprotection against ischemia in coronary heart disease.
Genetic variations in regulator of G‐protein signaling (RGS) confer risk of bladder cancer
Authors: Lee Eugene K. , Ye Yuanquing , Kamat Ashish M. , Wu Xifeng 
Published: March 2013

AbstractBACKGROUND:Alterations in the regulator of G‐protein signaling (RGS) pathway have been implicated in several cancers; therefore, the authors investigated the role of such alterations in overall bladder cancer risk, recurrence, progression, and survival.METHODS:In this case‐control series, 803 patients with bladder cancer were frequency‐matched with a control cohort of 803 healthy individuals. Ninety‐five single‐nucleotide polymorphisms (SNPs) in 17 RGS genes were investigated for an association with overall bladder cancer risk, recurrence, and progression in patients who had nonmuscle‐invasive bladder cancer (NMIBC) and for an association with death in patients who had muscle‐invasive bladder cancer (MIBC). Cumulative effects and classification and regression tree analyses were performed for SNPs that were associated with overall bladder cancer risk. Kaplan‐Meier plots were created to evaluate differences in the survival of patients with MIBC.RESULTS:Reference SNP 10759 (rs10759) on the RGS4 gene demonstrated the greatest association with overall bladder cancer risk, conferring a 0.77‐fold reduced risk with an increasing number of variant alleles (P < .001). A cumulative effects analysis that included all 5 significant SNPs demonstrated an increasing risk with the number of unfavorable genotypes (odds ratio, 4.13; 95% confidence interval, 2.14‐7.98). In patients with NMIBC, 11 SNPs were identified that had an association with disease recurrence, and 13 SNPs were associated with disease progression. Of the 10 SNPs that were associated with death in patients with MIBC, rs2344673 in an additive model was the most significant and was associated with a decreased median survival of 13.3 months compared with 81.9 months in individuals without a variant allele.CONCLUSIONS:Genetic variations in the RGS pathway were associated with the overall risk of bladder cancer, recurrence, and progression in patients with NMIBC and with the risk of death in patients with MIBC. Cancer 2013. © 2013 American Cancer Society.
Ion‐Acoustic Waves Instability in a Three Components Magneto‐Plasma with Nonthermal Electrons
Authors: Haider M. M. 
Published: March 2013

AbstractA theoretical investigation has been made on obliquely propagating ion‐acoustic (IA) solitary structures in a three components magneto‐plasma containing cold inertial ions, Boltzmann distributed positrons, and hot non‐thermal electrons. The Zakharov‐Kuznetsov equation has been derived by the reductive perturbation method, and its solitary wave solution has been analyzed. Multi‐dimensional instability has also studied by the small‐k (long wave‐length plane wave) perturbation expansion technique, which is found to exist in such a plasma. The effects of the external magnetic field, nonthermal electrons, obliqueness and temperature ratio have significantly modified the basic properties of small but finite‐amplitude IA solitary waves, such as amplitude, width, instability criterion and the growth rate. The present investigation contributes to the physics of the nonlinear IA waves in space and laboratory electron‐positron‐ion magneto‐plasmas in which wave damping produces an electron tail. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)