bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Non‐Magnetic and Magnetic Supported Copper(I) Chelating Adsorbents as Efficient Heterogeneous Catalysts and Copper Scavengers for Click Chemistry.
Authors: Megia‐Fernandez Alicia , Ortega‐Munoz Mariano , Lopez‐Jaramillo Javier , Hernandez‐Mateo Fernando , Santoyo‐Gonzalez Francisco 
Published: March 2011

AbstractThe title compounds (I) and (II) are efficient ligands for Cu(I)‐catalyzed click reactions using a variety of alkynes and azides.
ChemInform Abstract: Complementary Regioselectivity in the Cu(I)‐Catalyzed Diamination of Conjugated Dienes to Form Cyclic Sulfamides.
Authors: Cornwall Richard G. , Zhao Baoguo , Shi Yian 
Published: March 2011

AbstractDiamination takes place at the terminal double bond of the dienyl substrates using the CuCl/PBu3 catalytic system, while CuBr alone changes the reaction path to diamination at the internal double bond.
ChemInform Abstract: Synthesis of Functionalized 3,4‐Dihydropyrans via Rearrangement of the Products of a One‐Pot Diastereoselective Assembly of Ketones and Acetylene.
Authors: Schmidt Elena Yu. , Trofimov Boris A. , Zorina Nadezhda V. , Mikhaleva Albina I. , Ushakov Igor A. , Skital'tseva Elena V. , Kazheva Olga N. , Alexandrov Grigorii G. , Dyachenko Oleg A. 
Published: March 2011

AbstractThe reaction of the bicyclooctanes, previously formed from ketones and acetylene, is catalyzed by TFA and proceeds within seconds to afford the highly substituted dihydropyrans with complete diastereoselectivity.
ChemInform Abstract: Synthesis of 2‐Perfluoroalkyl 4H‐ and 2H‐Chromenylphosphonates Mediated by Amines and Phosphines.
Authors: Duda Blazej , Tverdomed Sergey N. , Roeschenthaler Gerd‐Volker 
Published: March 2011

AbstractNew, convenient methods to prepare biologically important title compounds are reported.
ChemInform Abstract: Platinum/Scandium‐Cocatalyzed Cascade Cyclization and Ring‐Opening Reaction of Tertiary Amines with Substituted Salicylaldehydes to Synthesize 3‐(Aminoalkyl)coumarins.
Authors: Xia Xiao‐Feng , Shu Xing‐Zhong , Ji Ke‐Gong , Shaukat Ali , Liu Xue‐Yuan , Liang Yong‐Min 
Published: March 2011

AbstractIt provides a new, straightforward, and widely applicable method to prepare 3‐(aminoalkyl)coumarins.
ChemInform Abstract: Divergent Products Obtained from the Reactions of Salicylaldehyde and 4‐Hydroxycoumarin in TEBAC‐H2O, KF‐Al2O3‐EtOH, and Ionic Liquid.
Authors: Wang Xiang‐Shan , Zhou Jie , Yang Ke , Zhang Mei‐Mei 
Published: March 2011

AbstractCompounds (V) are intermediates for the formation of either products (III) or (IV).
ChemInform Abstract: Expeditious Pechmann Condensation by Using Biodegradable Cellulose Sulfuric Acid as a Solid Acid Catalyst.
Authors: Kuarm B. Suresh , Madhav J. Venu , Laxmi S. Vijaya , Rajitha B. , Reddy Y. Thirupathi , Reddy P. Narsimha , Crooks Peter A. 
Published: March 2011

AbstractThe reaction is conducted under solvent‐free conditions and can also be carried out without microwave irradiation but with prolonged reaction time.
ChemInform Abstract: Asymmetric Synthesis of Chiral N‐Sulfinyl 3‐Alkyl‐ and 3‐Arylpiperidines by α‐Alkylation of N‐Sulfinyl Imidates with 1‐Chloro‐3‐iodopropane.
Authors: Colpaert Filip , Mangelinckx Sven , De Kimpe Norbert 
Published: March 2011

AbstractA new and efficient method to prepare enantiomerically pure 3‐substituted piperidines is reported.
ChemInform Abstract: CuI/I2‐Promoted Electrophilic Tandem Cyclization of 2‐Ethynylbenzaldehydes with ortho‐Benzenediamines: Synthesis of Iodoisoquinoline‐Fused Benzimidazoles.
Authors: Ouyang Huang‐Che , Tang Ri‐Yuan , Zhong Ping , Zhang Xing‐Guo , Li Jin‐Heng 
Published: March 2011

AbstractThe title reaction allows a new, convenient access to synthetically and biologically important benzimidazoles of type (III).
ChemInform Abstract: 4‐Chloro‐3‐(trifluoroacetyl)coumarin as a Novel Building Block for the Synthesis of 7‐(Trifluoromethyl)‐6H‐chromeno[4,3‐b]quinolin‐6‐ones.
Authors: Iaroshenko Viktor O. , Ali Sajid , Babar Tariq Mahmood , Dudkin Sergii , Mkrtchyan Satenik , Rama Nasim Hasan , Villinger Alexander , Langer Peter 
Published: March 2011

AbstractAn efficient synthesis of chromenoquinolinone derivatives (IV) (14 examples) is achieved through reaction of coumarin (I) with anilines followed by intramolecular cyclization of intermediates (III).
ChemInform Abstract: Domino N—H/C—H Bond Activation: Copper‐Catalyzed Synthesis of Nitrogen‐Bridgehead Heterocycles Using Azoles and 1,4‐Dihalo‐1,3‐dienes.
Authors: Liao Qian , Zhang Liyun , Li Shutao , Xi Chanjuan 
Published: March 2011

AbstractThe reaction proceeds with high regioselectivity.
ChemInform Abstract: 5‐Aminouracil as a Building Block in Heterocyclic Synthesis. Part 3. One‐Pot Synthesis of Novel Pyrimido[5,4‐b]quinoline‐2,4,9‐triones and Pyrimido[5,4‐c]isoquinolines.
Authors: Shaker Raafat M. , Sadek Kamal U. , Hafez Ebtisam A. , Elrady Mohamed Abd 
Published: March 2011

AbstractEfficient and direct protocols for the regioselective synthesis of the title compounds (IV) and (IX), resp., using multicomponent reactions of 5‐aminouracil (II) are given.
ChemInform Abstract: [4 + 3] Cycloaddition of Aromatic α,β‐Unsaturated Aldehydes and Ketones with Epoxides: One‐Step Approach to Synthesize Seven‐Membered Oxacycles Catalyzed by Lewis Acid.
Authors: Zhou Yu‐Qiang , Wang Nai‐Xing , Zhou Shu‐Bao , Huang Zhong , Cao Linghua 
Published: March 2011

AbstractIt allows a new and mild access to 7‐membered oxacycles such as (III), (VI), (VIII), and (IX).
ChemInform Abstract: Asymmetric Organocatalytic Conjugate Addition of Diarylphosphane Oxides to Chalcones.
Authors: Russo Alessio , Lattanzi Alessandra 
Published: March 2011

AbstractA wide range of trans‐chalcones, bearing electron‐donating and electron‐withdrawing groups in both aromatic substituents is tolerated in the reaction, catalyzed by dihydroquinine alkaloid.
ChemInform Abstract: Electrophilic Cyclization of 3‐Alkynyl‐4‐chalcogen‐2H‐chromenes: Synthesis of 3‐Halo‐chalcogenophene[3,2‐c]chromene Derivatives.
Authors: Speranca Adriane , Godoi Benhur , Costa Michael Daniel , Menezes Paulo Henrique , Zeni Gilson 
Published: March 2011

AbstractIodocyclization of lithiated 3‐alkynyl‐4‐chalcogen‐2H‐chromenes with elemental iodine offers an efficient synthesis of 3‐iodo‐chalcogenophene‐chromenes in good yields.
ChemInform Abstract: One‐Pot Synthesis of Selenoureas and Selenocarbamates via Selenation of Isocyanates with Bis(dimethylaluminum) Selenide.
Authors: Maeda Hajime , Takashima Masaru , Sakata Koichi , Watanabe Tatsuya , Honda Mitsunori , Segi Masahito 
Published: March 2011

AbstractA direct selenation of isocyanates to isoselenocyanates is developed using freshly generated (Me2)2Se.
ChemInform Abstract: Synthesis of D‐Glucosamine‐Modified Benzo[d][1,2]selenazol‐3‐(2H)‐one Derivatives.
Authors: Zhang Zhongwei , Ren Sumei , Wan Shengbiao , Li Wei , Jiang Tao 
Published: March 2011

AbstractAn efficient synthetic method for the preparation of organoselenium‐saccharide derivates (III), (V), (VII), and (X) are developed via a cyclization reaction.
ChemInform Abstract: A Practical Synthesis of trans‐3‐Substituted Proline Derivatives Through 1,4‐Addition.
Authors: Huy Peter , Neudoerfl Joerg‐Martin , Schmalz Hans‐Guenther 
Published: March 2011

AbstractA short synthesis of trans‐3‐substituted proline derivatives such as (VII) is accomplished by Cu‐catalyzed addition of Grignard reagents to dehydroproline esters (III).
ChemInform Abstract: Hatomarubigin E, a Biosynthetic Intermediate of Hatomarubigins C and a Substrate of HrbU O‐Methyltransferase
Authors: Kawasaki Takashi , Yamada Yuki , Maruta Tomoka , Maeda Ayumi , Hayakawa Yoichi 
Published: March 2011

Abstractisolation, structure elucidation and ezymatic conversion of title antibiotic (I)
Researches on Thermal Decomposition Kinetics of Composite Modified Double‐base Propellants
Authors: Tang Zhan , Ren Yan , Yang Li , Zhang Tonglai , Qiao Xiaojing , Zhang Jianguo , Zhou Zunning , Zhao Fengqi , Dang Yongzhan , Xu Siyu , Yi Jianhua 
Published: March 2011

AbstractThe thermal decomposition kinetics of composite modified double‐base (CMDB) propellants with a series of contents of hexogeon (RDX) was investigated by using parameters of Teo, Ti, Tp, Tf, Tb, Ta, E, lg A and ΔH, which were obtained from using a CDR‐4P differential scanning calorimeter (DSC) and Perkin‐Elmer Pyris 1 thermogravimetric analyzer (TG) analyses with heating rates of 5, 10, 15 and 20 K/min. Reliable activation energy was calculated using Flynn‐Wall‐Ozawa method before analyzing the thermal decomposition mechanism. TG‐DTG curves were treated with Malek method in order to obtain the reaction mechanisms. The obtained results show that the thermal decomposition mechanisms with the conversion from 0.2 to 0.4 was f(α)1/2α, and with the conversion from 0.5 to 0.7 was f(α)(1/4)(1−α)[−ln(1−α)]−3.
Comparison of Bottom‐up Filling in Electroless Plating with an Addition of PEG, PPG and EPE
Authors: Yang Zhifeng , Wang Zhixiang , Wang Xu , Wang Zenglin 
Published: March 2011

AbstractThe bottom‐up filling capabilities of electroless copper plating bath with an addition of additives, such as polyethylene glycol (PEG), polypropylene glycol (PPG) and triblock copolymers of PEG and PPG with ethylene oxide terminal blocks termed EPE, were investigated by the cross‐sectional scanning electron microscopy (SEM) observation of sub‐micrometer trenches. Though three additives had inhibition for electroless copper deposition, the suppression degrees of three additives were different. EPE‐2000 had the strongest suppression for electroless copper deposition, and the suppression of PEG‐2000 was the weakest. The bottom‐up filling capability of electroless copper was investigated in a plating bath containing different additives with the concentration of 2.0 mg/L. The cross‐sectional SEM observation indicated the trenches with the width of 280 nm and the depth of 475 nm were all completely filled by the plating bath with an addition of EPE‐2000, but the trenches were not completely filled by the plating bath with an addition of PEG‐2000 or PPG‐2000, and some voids appeared. Linear sweep voltammetry measurement indicated that three additives all inhibited the cathodic reduction reaction and the anodic oxidation reaction, and the inhibition of EPE‐2000 was the strongest among three additives, which agreed with that of the deposition rate of electroless copper. Significant differences in surface roughness of deposited copper film were observed by UV‐visible near‐infrared for different suppressors, and the bright and smooth of deposited copper film were in accordance with the inhibition of three additives.
Photoluminescence Properties of a Promising Red‐emitting Phosphor CaNb2O6:Eu3+ for Trichromatic White Light Emitting Diodes Application
Authors: Huang Junlia , Zhou Liya , He Xipu , Gong Fuzhong 
Published: March 2011

AbstractMotivated by the need for new phosphors of white light emitting diode (WLED) application, Ca0.95Nb2 O6:Eu3+0.05 phosphors were synthesized by high temperature solid‐state reaction. Increasing the content of doped‐Eu3+ and adding the co‐activator Bi3+ to improve the photoluminescence (PL) intensity of Ca1−xNb2 O6Eu3+x phosphors were investigated in detail. The effects of Eu3+ were better than that of Bi3+ on the PL intensity of Ca1−xNb2 O6Eu3+x phosphors. Compared with Y2O2 S:0.05Eu3+ the Ca0.70Nb2 O6:Eu3+0.03 phosphor could be excited efficiently by UV (395 nm) light and emit the red light at 614 nm with line spectra, which were coupled well with the characteristic emission from UV‐Near UV LED. The CIE (International Commission on Illumination) chromaticity coordinates (x0.654, y0.348) of Ca0.70Nb2O6:Eu3+0.03 were close to the NTSC (National Television Standard Committee) standard values. Therefore Ca0.70Nb2 O6:Eu3+0.03 might find application to UV‐Near UV InGaN chip‐based white light emitting diodes, which is further proved by the LED fabrication with the Ca0.70Nb2 O6:Eu3+0.03 phosphor.
Effect of Substitution of Cobalt for Iron in Sr4Fe6O13−( on the Catalytic Activity for Methane Combustion
Authors: Feng Shaojie , Wang Zhenghong , Yang Pinghua 
Published: March 2011

AbstractA series of mixed oxides Sr4Fe6−xCoxO13−δ (x=0, 1, 2, 3, or 4) were prepared by sol‐gel method and used for catalytic combustion of methane. The structural properties of oxides were characterized by XRD, TGA, and XPS. The layered intergrowth perovskite‐like oxide Sr4Fe5CoO13−δ exhibits the highest catalytic activity for methane combustion under the experimental conditions. The enhanced catalytic activity of Sr4Fe5CoO13−δ for methane combustion could be attributed to the increased amount of oxygen vacancy caused by the partial substitution of cobalt for iron in the Sr4Fe6O13, which was confirmed by TGA and XPS.
A Novel Synthetic Method for the Preparation of Aliphatic Aldehydes from the Corresponding Carboxylic Acids
Authors: Guo Yuan , Lu Zhenhuan , Yao Libo , Shi Zhen 
Published: March 2011

AbstractA novel synthetic method for the preparation of aliphatic aldehydes from the corresponding carboxylic acids via 1,3‐dimethylbenzimidazolium salts is provided. 1,3‐Dimethylbenzimidazolium salts were rapidly reduced with sodium/ethanol and then hydrolyzed with hydrochloric acid to obtain aliphatic aldehydes, in which the 1,3‐dimethylbenzimidazolium salts can be readily achieved from the corresponding carboxylic acids. The mechanism for the reductive reaction of 1,3‐dimethylbenzimidazolium salts with sodium/ethanol was discussed.
Enhanced Sensitivity and Selectivity of Chemosensor for Malonate by Anchoring on Gold Nanoparticles
Authors: Liu Yanyun , Liu Yun , Liang Zhongshi , Li Xiangyang , Liu Shunying , Yu Jiahui 
Published: March 2011

AbstractA novel organic‐inorganic nanohybrided receptor 4 functionalized with bis‐thiourea arms and then assembled on gold nanoparticles was synthesized. The preorganized system possesses phenylthiourea units for the spectrophotometric sensing of dicarboxylates, especially malonate, based on changes in the surface plasmon absorption of the gold nanoparticles (GNPs). The intensity of the absorbance band increases gradually with the concentration of dicarboxylates increasing. But such an ion‐selective change in the plasmon band was not observed in control tests carried out by mono‐thiourea‐modified GNPs, receptor 3and the free receptor2. As it is shown from the association constants, derived from quantitative titrations, receptor 4 can selectively recognize dicarboxylate anions of shorter carbon chain, and has the highest affinity to malonate. The interaction properties for anions of receptor 4 were evaluated by 1H NMR and UV‐vis spectroscopic methods.
Is resection of colorectal liver metastases after a second‐line chemotherapy regimen justified?
Authors: Brouquet Antoine , Overman Michael J. , Kopetz Scott , Maru Dipen M. , Loyer Evelyne M. , Andreou Andreas , Cooper Amanda , Curley Steven A. , Garrett Christopher R. , Abdalla Eddie K. , Vauthey Jean‐Nicolas 
Published: March 2011

AbstractBACKGROUND:Patient outcomes following resection of colorectal liver metastases (CLM) after second‐line chemotherapy regimen is unknown.METHODS:From August 1998 to June 2009, data from 1099 patients with CLM were collected prospectively. We retrospectively analyzed outcomes of patients who underwent resection of CLM after second‐line (2 or more) chemotherapy regimens.RESULTS:Sixty patients underwent resection of CLM after 2 or more chemotherapy regimens. Patients had advanced CLM (mean number of CLM ± standard deviation, 4 ± 3.5; mean maximum size of CLM, 5 ± 3.2 cm) and had received 17 ± 8 cycles of preoperative chemotherapy. In 54 (90%) patients, the switch from the first regimen to another regimen was motivated by tumor progression or suboptimal radiographic response. All patients received irinotecan or oxaliplatin, and the majority (42/60 [70%]) received a monoclonal antibody (bevacizumab or cetuximab) as part of the last preoperative regimen. Postoperative morbidity and mortality rates were 33% and 3%, respectively. At a median follow‐up of 32 months, 1‐year, 3‐year, and 5‐year overall survival rates were 83%, 41%, and 22%, respectively. Median chemotherapy‐free survival after resection or completion of additional chemotherapy administered after resection was 9 months (95% confidence interval, 4‐14 months). Synchronous (vs metachronous) CLM and minor (vs major) pathologic response were independently associated with worse survival.CONCLUSIONS:Resection of CLM after a second‐line chemotherapy regimen was found to be safe and was associated with a modest hope for definitive cure. This approach represents a viable option in patients with advanced CLM. Cancer 2011;. © 2011 American Cancer Society.
Corporate Reputation: A Combination of Social Responsibility and Industry
Authors: Melo Tiago , Garrido‐Morgado Alvaro 
Published: March 2011

ABSTRACTWe use the technique of panel data in a sample of 320 American listed companies from 2003 to 2007 to estimate a model of corporate reputation, measured by the Fortune index. We propose that corporate social responsibility (CSR) is a key driver of corporate reputation given its potential to foster hard‐to‐duplicate competitive advantage. Our model embodies the multidimensional concept of CSR, presenting a five dimensional construct – employee relations, diversity issues, product issues, community relations, and environmental issues – and interact those with industrial effects. Our results indicate that the five dimensions of CSR have a significant impact on corporate reputation and this impact is moderated by the industry of the firm. The most salient dimensions were diversity of the work force – was positively relevant to eight of the nine industries; and product issues with a positive impact in five industries and negative in three. Copyright © 2011 John Wiley & Sons, Ltd and ERP Environment.
A novel variable frequency modulation technique to improve light‐load efficiency for multiphase synchronous rectified VRM
Authors: Ou Sheng‐Yuan , Hsiao Ho‐Pu , Su Huei‐Fa 
Published: March 2011

SUMMARYA novel variable frequency modulation technique for multiphase synchronous rectified voltage regulator module (VRM) is proposed in this paper. The proposed technique provides zero voltage switching (ZVS) for high‐side and low‐side power switches under both light‐ and heavy‐load conditions, thereby increasing the efficiency as compared to the conventional approach. The dependency of switching frequency on the load condition for the proposed modulation technique and the related conduction loss are analyzed. It will be shown that the frequency increases for light‐load condition in order to retain ZVS and decrease the conduction loss. Although the switching loss will slightly increase due to the increase of switching frequency, the analysis and experimental results will show that the contribution of frequency increasing can cover this additional loss. Experimental results derived from a single‐phase and an eight‐phase synchronous rectified VRM show that the proposed modulation technique is superior to the conventional one and compared to conventional constant switching frequency techniques with 250 and 550thinspacekHz, the efficiency can be increased up to 17 and 5% for single‐phase VRM and 8 and 4% for eight‐phase VRM under various load conditions. Even an off‐the‐shelf controller with an additional simple and cheap control circuit comprising one switch, two operational amplifiers and several resistors is used to realize the proposed technique, that is, a very low cost and small circuitry is attached to gain the significant benefit. Copyright © 2011 John Wiley & Sons, Ltd.
Determination of flavour loading in complex delivery systems by time‐domain NMR
Authors: Hafner Valeria , Dardelle Gregory , Normand Valéry , Fieber Wolfgang 
Published: March 2011

AbstractThe determination of the flavour content of a newly developed encapsulation system based on yeast was attempted using time‐domain NMR (TD‐NMR) and compared to thermo gravimetric analysis (TGA). Flavour content as measured by TD‐NMR is systematically higher than by TGA. The constant discrepancy between the two techniques is attributed to the presence of the phospholipidic membrane inside the yeast. These phospholipids also contribute to the NMR signal as was revealed by high field NMR studies under magic angle spinning conditions. The signal obtained for the empty yeast matched the extra‐contribution to the signal of the flavoured yeast encapsulation system. A classical glassy encapsulation system was used as a comparison to highlight further the presence of the phospholipids in the yeast system. A two step procedure is proposed to correct the reading of the flavoured yeast for the contribution of the yeast cells themselves.Practical applications: TD‐NMR is routinely used for the determination of the liquid content encapsulated in a solid matrix, where the liquid can be any oil, including lipids, or flavour and fragrance oils. As shown in the present study, in order to obtain accurate values of the oil loading, the nature of the carrier material of the encapsulation system must be taken into account. For example, with the conventional TD‐NMR method, flavour loading in encapsulation systems in yeast cells is systematically overestimated since the phospholipid bilayer contributes to the NMR signal of the flavour oil. With the two‐step procedure presented in this article, by subtracting the baseline value obtained for empty yeast cells, accurate loading values for yeast cell carriers can be determined. The modified testing approach is highly accurate and widely applicable to a variety of liquids including flavours, perfumes or nutritive fish oils encapsulated in solid delivery systems.
Total Synthesis of the (+)‐Antimycin A Family
Authors: Inai Makoto , Nishii Takeshi , Tanaka Ayako , Kaku Hiroto , Horikawa Mitsuyo , Tsunoda Tetsuto 
Published: March 2011

AbstractAn asymmetric aldol reaction using Oppolzer's sultam has provided a practical and efficient synthetic route (15 steps, overall yield ca. 24 %) to 12 compounds of the Antimycin A family and deisovalerylblastmycin, which were obtained in pure form on a 60–300 mg scale. In the syntheses, the nine‐membered dilactone ring was constructed successfully by lactonization of a 2‐pyridinethiol ester bearing a TIPS group on the 8‐OH by using the (CuOTf)2·PhH complex.