bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Iron(0) Particles: Catalytic Hydrogenations and Spectroscopic Studies.
Authors: Welther Alice , Bauer Matthias , Mayer Matthias , Jacobi von Wangelin Axel 
Published: January 2013

AbstractThe title reaction is successfully carried out under economic and environmentally friendly conditions with iron as a cheap and nontoxic metal catalyst for various allylbenzenes, styrenes, stilbenes, and diarylacetylenes.
ChemInform Abstract: A Soluble Copper(I) Source and Stable Salts of Volatile Ligands for Copper‐Catalyzed C—X Couplings.
Authors: Maligres Peter E. , Krska Shane W. , Dormer Peter G. 
Published: January 2013

AbstractIt is found that soluble [Cu2I4](Bu4N)2 in combination with the MesOH salts of 1,2‐cyclohexanediamine, N,N≈‐dimethylcyclohexanediamine, and N,N≈‐dimethylethylenediamine efficiently promotes the coupling of aromatic, vinylic, and acetylenic iodides and bromides with amines.
ChemInform Abstract: Direct Oxidative Coupling of Arenes with Olefins by Rh‐Catalyzed C—H Activation in Air: Observation of a Strong Cooperation of the Acid.
Authors: Zheng Lu , Wang Jianhui 
Published: January 2013

AbstractA series of monosubstituted or 1,2‐ or 1,3‐disubstituted arenes undergo the coupling with acrylates, styrene, allylbenzene or olefin (Xb) in the presence of air as terminal oxidant, Cu(OAc)2 as co‐oxidant, and CCl3COOH as highly efficient additive.
ChemInform Abstract: Structure Influence of Chiral 1,1′‐Biscarboline‐N,N′‐dioxide on the Enantioselective Allylation of Aldehydes with Allyltrichlorosilanes.
Authors: Bai Bing , Zhu Hua‐Jie , Pan Wei 
Published: January 2013

AbstractA new axially chiral biscarboline‐N,N′‐dioxide Lewis base organocatalyst is used in the asymmetric allylation of aldehydes with allyltrichlorosilane (I).
ChemInform Abstract: A Simple and Efficient Method for the Allylation of Heteroarenes Catalyzed by PdCl2.
Authors: Yuan Feng‐Quan , Sun Feng‐Yi , Han Fu‐She 
Published: January 2013

AbstractVarious furan, indole and thiophene derivatives are efficiently allylated with several allylic acetates used as an inseparable mixture of regioisomers in the presence of only 2 mol% of PdCl2 under mild conditions.
ChemInform Abstract: Iodide‐Promoted Deselenylation of β‐Chloro‐ and β‐Oxyselenides to Form Alkenes and Selenenyl Iodides.
Authors: Sase Shohei , Ebisawa Kazuaki , Goto Kei 
Published: January 2013

AbstractThe mechanism of the deselenylation reaction of β‐chloro‐ and β‐oxyselenides in the presence of tetrabutylammonium iodide is discussed.
ChemInform Abstract: A One‐Pot Selective Synthesis of N‐Boc Protected Secondary Amines: Tandem Direct Reductive Amination/N‐Boc Protection.
Authors: Neelarapu Raghupathi , Petukhov Pavel A. 
Published: January 2013

AbstractAn efficient, selective, step‐economic, and versatile procedure for the title synthesis is developed by using inexpensive and well‐tolerated reaction conditions with exception of weakly nucleophilic arylamines.
ChemInform Abstract: Positional Chemoselectivity in the Zn(II)‐Mediated Removal of Phenol Protecting Groups.
Authors: Fleury Lauren M. , Gianino Joseph B. , Ashfeld Brandon L. 
Published: January 2013

AbstractReaction conditions involving ZnCl2 are developed for the selective ortho‐deprotection of aldehydes or related carbonyl compounds.
ChemInform Abstract: Chiral Broensted Acid Catalyzed Enantioselective Allenylation of Aldehydes.
Authors: Reddy Leleti Rajender 
Published: January 2013

AbstractThe first chiral phosphoric acid catalyzed allenylation of aldehydes (I) with propargyl borolane (II) to provide enantiomerically enriched α‐allenic alcohols (III) is reported.
ChemInform Abstract: Enantioselective Tandem Reactions at Elevated Temperatures: One‐Pot Hydroformylations/SN1 Alkylation.
Authors: Stiller Julian , Vorholt Andreas J. , Ostrowski Karoline A. , Behr Arno , Christmann Mathias 
Published: January 2013

AbstractTerminal olefins and diarylmethanol (III) give under optimized conditions employing a rhodium/ruthenium/prolinol catalyst system α‐substituted aldehydes with up to 98% enantioselectivity.
ChemInform Abstract: Highly Efficient Synthesis of Polysubstituted Fluorene via Iron‐Catalyzed Intramolecular Friedel—Crafts Alkylation of Biaryl Alcohols.
Authors: Sarkar Soumen , Maiti Sukhendu , Bera Krishnendu , Jalal Swapnadeep , Janan Umasish 
Published: January 2013

AbstractThe transformation is achieved under extremely mild and neutral conditions to give various fluorene structure including spirobifluorene (XII).
ChemInform Abstract: Exploiting the Lithiation‐Directing Ability of Oxetane for the Regioselective Preparation of Functionalized 2‐Aryloxetane Scaffolds under Mild Conditions.
Authors: Coppi Donato Ivan , Salomone Antonio , Perna Filippo Maria , Capriati Vito 
Published: January 2013

AbstractThe first examples for utilization of oxetane as an directing metalation group are presented.
ChemInform Abstract: Enantioselective Conversion of Primary Alcohols to α‐exo‐Methylene γ‐Butyrolactones via Iridium‐Catalyzed C—C Bond‐Forming Transfer Hydrogenation: 2‐(Alkoxycarbonyl)allylation.
Authors: Montgomery T. Patrick , Hassan Abbas , Park Boyoung Y. , Krische Michael J. 
Published: January 2013

AbstractIridium‐catalyzed transfer hydrogenative C—C coupling of acrylic ester (I) to alcohols (II) or (IV) induce the enantioselective formation of butyrolactones such as (III) or (V) via 2‐(alkocycarbonyl)allylation.
ChemInform Abstract: Zinc‐Catalyzed Dehydrogenative N‐Silylation of Indoles with Hydrosilanes.
Authors: Tsuchimoto Teruhisa , Iketani Yoshihiko , Sekine Masaru 
Published: January 2013

AbstractZinc triflate in a nitrile solvent is an effective catalyst for the title reaction of indoles with an substituent at any of the six possible positions, as well as pyrroles and carbazoles.
ChemInform Abstract: Multicomponent Reaction to Construct Spirocyclic Oxindoles with a Michael (Triple Michael)/Cyclization Cascade Sequence as the Key Step.
Authors: Li Jian , Wang Ning , Li Chunju , Jia Xueshun 
Published: January 2013

AbstractThe reaction of an isocyanide, an allenoate, and an isatylidene malononitrile is studied for a variety of examples.
ChemInform Abstract: Development of Diamidophosphite Ligands and Their Application to the Palladium‐Catalyzed Vinyl‐Substituted Trimethylenemethane Asymmetric [3 + 2] Cycloaddition.
Authors: Trost Barry M. , Lam Tom M. 
Published: January 2013

AbstractThe new ligand allows reactivity and selectivity that is not observed prior this work.
ChemInform Abstract: Synthesis of Some Azoles Incorporating a Sulfonamide Moiety as Anticonvulsant Agents.
Authors: Farag Awatef A. , Abd‐Alrahman Safaa N. , Ahmed Gihan F. , Ammar Ramy M. , Ammar Yousry A. , Abbas Samir Y. 
Published: January 2013

AbstractA variety of azole, pyridine and chromene derivatives incorporating a sulfonamide moiety are synthesized and evaluated for their anticonvulsant activity.
ChemInform Abstract: Synthesis of Naphtho[2,1‐b]pyranopyrrolothiazole Derivatives Through 1,3‐Cycloaddition Reaction
Authors: Kathiravan Subban , Raghunathan Raghavachary 
Published: January 2013

Abstractof cyclic azomethine ylides with Baylis—Hillman adducts (I)
ChemInform Abstract: Access to 2‐Alkyl Chromanones via a Conjugate Addition Approach.
Authors: Stubbing Louise A. , Li Freda F. , Furkert Daniel P. , Caprio Vittorio E. , Brimble Margaret A. 
Published: January 2013

AbstractThe introduction of alkyl substituents is performed via conjugate addition of silyl enol ethers to chromenones in the presence of TmsOTf.
ChemInform Abstract: Magnesium Oxide Nanotubes: Synthesis, Characterization and Application as Efficient Recyclable Catalyst for Pyrazolyl 1,4‐Dihydropyridine Derivatives.
Authors: Murugan R. , Ramamoorthy K. , Sundarrajan S. , Ramakrishna S. 
Published: January 2013

AbstractA mild, cost effective, and highly efficient catalyst is presented for the rapid, simple, and cleaner title reaction which includes an easy work‐up procedure.
ChemInform Abstract: New Domino Heteroannulation of Enaminones: Synthesis of Diverse Fused Naphthyridines.
Authors: Li Jing , Yu Yan , Tu Man‐Su , Jiang Bo , Wang Shu‐Liang , Tu Shu‐Jiang 
Published: January 2013

AbstractA mild, fast, excellent atom‐economical, and convenient one‐pot method for the synthesis of the title compound is described.
ChemInform Abstract: Synthesis of gem‐Difluorinated 1,6‐Naphthyridine‐5,7‐diones.
Authors: Piron Karel , Kenis Sara , Verniest Guido , Surmont Riccardo , Thuring Jan Willem , ten Holte Peter , Deroose Frederik , De Kimpe Norbert 
Published: January 2013

AbstractA copper‐mediated cross‐coupling of difluoroacetate (II) with haloarenes followed by hydrolysis of the nitrile group/cyclization gives access to title compounds.
ChemInform Abstract: Synthesis and Biological Evaluation of New Barbituric and Thiobarbituric Acid Fluoro Analogues of Benzenesulfonamides as Antidiabetic and Antibacterial Agents.
Authors: Faidallah Hassan M. , Khan Khalid A. 
Published: January 2013

AbstractAlmost all new compounds (III), (V), (VII), (VIII), and (X) possess very good antimicrobial activities.
ChemInform Abstract: Synthesis of Novel Benzoxazinone Compounds as Epidermal Growth Factor Receptor (EGFR) Tyrosine Kinase Inhibitors.
Authors: Chen Shaopeng , Li Xuemin , Wan Shengbiao , Jiang Tao 
Published: January 2013

AbstractTwo analogues of the anticancer drug gefitinib and lapatinib, the novel benzoxazinone derivatives (XI), are designed and synthesized starting from dihydrobenzoic acid (I).
ChemInform Abstract: An Imine‐Based Route to Polycyclic Chlorinated ε‐Lactams by Formation of C—C Bonds as Key Steps.
Authors: Brockmeyer Fabian , Stalling Timo , Martens Juergen 
Published: January 2013

AbstractSaturated and unsaturated versions of the desired heterocyclic skeleton are prepared as diastereomeric mixtures.
ChemInform Abstract: Palladium‐Catalyzed 8‐exo‐trig Intramolecular Heck Reaction under Microwave Irradiation in the Presence of Basic Alumina.
Authors: Mondal Nirup B. , et al. et al. 
Published: January 2013

AbstractThis is the first report about benzoxocinoquinoline synthesis through the application of a Heck‐type coupling reaction.
ChemInform Abstract: The Liquid Junction Potential in Potentiometric Titrations. XII. The Calculation of Potentials for Emf Cells with Liquid Junctions, of the Type, AY / AY + A2MoO4 + HY, Involving the Formation of Iso‐Polymolybdates in the Range ‐Log10[H+] ≤ 7, at [A+] 0 C mol·L‐1, Constant, and 25 °C
Authors: Neher‐Neumann Erzsebet 
Published: January 2013

AbstractReview: 69 refs.
ChemInform Abstract: Flavonoids in Subtribe Centaureinase (Cass.) Dumort. (Tribe Cardueae, Asteraceae): Distribution and 13C‐NMR Spectral Data
Authors: Formisano Carmen , Rigano Daniela , Senatore Felice , Bancheva Svetlana , Maggio Antonella , Rosselli Sergio , Bruno Maurizio 
Published: January 2013

AbstractReview: 348 refs.
Design of high‐speed low‐power parallel‐prefix adder trees in nanometer technologies
Authors: Perri Stefania , Lanuzza Marco , Corsonello Pasquale 
Published: January 2013

ABSTRACTThis paper presents a novel approach to design high‐speed low‐power parallel‐prefix adder trees. Sub‐circuits typically used in the design of parallel‐prefix trees are deeply analyzed and separately optimized. The modules used for computing the group propagate and generate signals have been designed to improve their energy‐delay behavior in an original way. When the ST 45 nm 1 V CMOS technology is used, in comparison with conventional implementations, the proposed approach exhibits computational delay with mean value and standard deviation up to 40% and 48% lower and achieves energy consumption with mean value and standard deviation up to 57% and 40% lower.A 32‐bit Brent‐Kung tree made as proposed here reaches a computational delay lower than 165 ps and dissipates 147.4fJ on average. Copyright © 2013 John Wiley & Sons, Ltd.
Highly linear wide‐swing continuous tuning of CMOS transconductors
Authors: Algueta Jose M. , Lopez‐Martin Antonio J. , Ramirez‐Angulo Jaime , Carvajal Ramon G. 
Published: January 2013

SUMMARYA technique to improve the input and output range of CMOS transconductors with resistive current division for continuous tuning is presented. Using it, a tunable transconductor is proposed which features high linearity over a wide input range and simplicity. Measurement results of the transconductor, fabricated in a 0.5 µm CMOS process, show an IM3 of −66 dB for a ±1.65 V supply and two input tones centered at 1 MHz of 1 Vpp each, and only 0.7 mW of power consumption. This represents an improvement of 13 dB versus the same transconductor using conventional current division. Copyright © 2013 John Wiley & Sons, Ltd.
An ultra‐thin oxide sub‐1 V CMOS bandgap voltage reference
Authors: Bohannon Eric , Washburn Clyde , Mukund P.R. 
Published: January 2013

ABSTRACTThis paper presents a sub‐1 V CMOS bandgap voltage reference that accounts for the presence of direct tunneling‐induced gate current. This current increases exponentially with decreasing oxide thickness and is especially prevalent in traditional (non‐high‐κ/metal gate) ultra‐thin oxide CMOS technologies (tox < 3 nm), where it invalidates the simplifying design assumption of infinite gate resistance. The developed reference (average temperature coefficient, TC_AVG, of 22.5 ppm/°C) overcomes direct tunneling by employing circuit techniques that minimize, balance, and cancel its effects. It is compared to a thick‐oxide voltage reference (TC_AVG = 14.0 ppm/°C) as a means of demonstrating that ultra‐thin oxide MOSFETs can achieve performance similar to that of more expensive thick(er) oxide MOSFETs and that they can be used to design the analog component of a mixed‐signal system. The reference was investigated in a 65 nm CMOS technology with a nominal VDD of 1 V and a physical oxide thickness of 1.25 nm. Copyright © 2013 John Wiley & Sons, Ltd.
Reducing the power envelope fluctuation of OFDM systems using side information supported amplitude clipping approach
Authors: Taher Montadar Abas , Mandeep JS , Ismail Mahamod , Samad Salina Abdul , Islam MT 
Published: January 2013

ABSTRACTOFDM is an important modulation technique currently in development in the field of communications systems. OFDM signals can combat multipath propagation and fading channels and can support large data rates. However, OFDM systems are multicarrier systems and experience problems due to the required summation of sinusoids when the in‐phase subcarriers are combined, which produces high power peaks. The large power envelope fluctuations that occur at the output cause in‐band and out‐of‐band distortions that result in degraded BER performance. The literature contains many qualified approaches to resolving the peak‐to‐average power ratio problem, including selected mapping, partial transmit sequence, and amplitude clipping techniques. The simplest technique is the amplitude clipping technique, and the selected mapping and partial transmit sequence techniques are excessively complicated for real‐time implementation. In this paper, we suggest a modification to the amplitude clipping method to produce a novel clipping technique called the side information supported amplitude clipping (SI‐SAC) method. The SI‐SAC technique involves sending certain bits of extra information so that the receiver can recover all of the clipped data. The SI‐SAC technique does not add computational complexity to the system, and simulation results show that the proposed method is superior to the conventional method. The peak‐to‐average power ratio was reduced by ≈2.5 dB, and the magnitude of the mean squared error vector is the same as that of the original signal that is not clipped. In contrast, the conventional amplitude clipping method produces a mean squared error vector with a large magnitude. Copyright © 2012 John Wiley & Sons, Ltd.
A data aware 9T static random access memory cell for low power consumption and improved stability
Authors: Singh Ajay Kumar , Seong Mah Meng , Prabhu C. M. R. 
Published: January 2013

ABSTRACTReducing the power consumption in static random access memory can significantly improve the system power efficiency, reliability, and performance. In this paper, we propose a data aware static random access memory cell to reduce the power consumption during read and write operation. The proposed cell contains nine transistors with separate read/write ports. The write operation in the proposed cell is controlled by an additional write signal instead of word line. Because of isolation of the storage nodes with bit lines, read signal‐to‐noise margin is equal to ideal hold signal‐to‐noise margin of the conventional cell. The proposed cell saves approximately more than 43% active power compared with the 6T cell and other published cells. The proposed cell gives faster write access and low leakage current compared with the conventional and other cells. About 99% standby column power reduction, with 128 cells, is observed in the proposed cell. Copyright © 2013 John Wiley & Sons, Ltd.
Design of a 75‐nW, 0.5‐V subthreshold complementary metal–oxide–semiconductor operational amplifier
Authors: Magnelli Luca , Amoroso Francesco A. , Crupi Felice , Cappuccino Gregorio , Iannaccone Giuseppe 
Published: January 2013

ABSTRACTThis work focuses on the subthreshold design of ultra low‐voltage low‐power operational amplifiers. A well‐defined procedure for the systematic design of subthreshold operational amplifiers (op‐amps) is introduced. The design of a 0.5‐V two‐stage Miller‐compensated amplifier fabricated with a 0.18‐µm complementary metal–oxide–semiconductor process is presented. The op‐amp operates with all transistors in subthreshold region and achieves a DC gain of 70 dB and a gain–bandwidth product of 18 kHz, dissipating just 75 nW. The active area of the chip is ≈0.057 mm2. Experimental results demonstrate that well‐designed subthreshold op‐amps are a very attractive solution to implement sub‐1‐V energy‐efficient applications for modern portable electronic systems. A comparative analysis with low‐voltage, low‐power op‐amp designs available in the literature highlights that subthreshold op‐amps designed according to the proposed design procedure achieve a better trade‐off among speed, power, and load capacitance. Copyright © 2013 John Wiley & Sons, Ltd.
Inkjet‐Printed Nanoscaled CuO for Miniaturized Gas‐Sensing Devices
Authors: Pashchanka Mikhail , Prasad Ravi M. , Hoffmann Rudolf C. , Gurlo Aleksander , Schneider Jörg J. 
Published: January 2013

AbstractParallel, separate, narrow tracks of nanoscaled cupric oxide, CuO, displaying a width of 100–150 μm were fabricated by inkjet printing using a molecular copper–keto‐acidoximato complex as the precursor for ink formulation. Printed patterns were obtained on various inorganic substrates, such as silicon, silicon dioxide, or alumina. Annealing temperatures of 180–200 °C were employed for the decomposition of the printed precursor into the pure nanoscaled CuO phase. The inkjet‐printed samples were cured at 450 °C to ensure their stability during gas‐sensor tests at elevated temperatures. The printed material showed considerable promise for miniaturized gas‐sensor cells and for the detection of low concentrations of carbon monoxide and hydrogen.
Luminescent Transparent Composite Films Based on Lanthanopolyoxometalates and Filmogenic Polysaccharides
Authors: Pinto Ricardo J. B. , Granadeiro Carlos M. , Freire Carmen S. R. , Silvestre Armando J. D. , Neto Carlos Pascoal , Ferreira Rute A. S. , Carlos Luís D. , Cavaleiro Ana M. V. , Trindade Tito , Nogueira Helena I. S. 
Published: January 2013

AbstractA series of polysaccharide‐based transparent composite films containing lanthanopolyoxometalates (LnPOMs) have been prepared by using a water‐soluble cationic chitosan derivative [HTCC = N‐(2‐hydroxypropyl)‐3‐trimethylammonium chitosan chloride] and pullulan (PUL). HTCC was more suitable than pure chitosan for this purpose due to its positive charge and solubility in water over a broad range of pH values. The LnPOMs [Ln(W5O18)2]9– (Ln = Eu and Tb) were incorporated into the polysaccharides. EuPOMs encapsulated in amorphous silica shells were also incorporated into the polysaccharides to test the effect on film processing of the loading of nanoparticles instead of LnPOM anions. The incorporation of LnPOMs or LnPOM/silica core/shell nanoparticles into either HTCC or PUL polysaccharides originated clear transparent films. These composite films are transparent in daylight and exhibit visible emission under UV excitation. Photoluminescence studies (emission and excitation spectra and emission decay curves) were performed on the newly prepared films.
Synthesis, Properties and Redox Behavior of Ene–Diyne Scaffolds Bearing 1‐ and 2‐Azulenyl Groups at the Periphery
Authors: Shoji Taku , Shimomura Erika , Maruyama Mitsuhisa , Ito Shunji , Okujima Tetsuo , Morita Noboru 
Published: January 2013

AbstractEne–diyne systems possessing 1‐ and 2‐azulenyl groups at the periphery were prepared by palladium‐catalyzed cross‐coupling reaction of 1‐ and 2‐ethynylazulenes with 9‐dibromomethylene‐9H‐fluorene and 9,10‐bis(dibromomethylene)‐9,10‐dihydroanthracene or 2‐iodoazulene with 9,10‐bis(diethynylmethylene)‐9,10‐dihydroanthracene under Sonogashira–Hagihara conditions. The redox behavior of the ene–diyne compounds was examined by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Moreover, a significant color change of the ene–diyne derivatives was observed with visible spectroscopy under electrochemical reduction conditions.
A Chloroacetate‐Caged Fluorescein Chemodosimeter for Imaging Cysteine/Homocysteine in Living Cells
Authors: Zhu Baocun , Zhao Yunzhou , Zhou Qi , Zhang Bing , Liu Lunying , Du Bin , Zhang Xiaoling 
Published: January 2013

AbstractA chloroacetate‐caged fluorescein chemodosimeter (CACFC) employing a double molecular recognition mechanism was designed and synthesized to selectively detect cysteine (Cys) and homocysteine (Hcy) over glutathione (GSH) and other amino acids. The results showed that CACFC could serve as a “naked‐eye” indicator, and quantitatively detect Cys and Hcy with a detection limit of 4 μM (Cys) and 7 μM (Hcy). Additionally, CACFC was successfully applied to the fluorescence imaging of Cys and Hcy in living cells. The mechanism of the reaction between CACFC and Cys/Hcy was confirmed by ESI‐MS and fluorescence spectroscopic analysis to involve a conjugate substitution/cyclization sequence. We highlight the simplicity of the design and synthesis and show that its combined properties, such as high specificity, high sensitivity, fast response, quantitative detection and real time Cys and Hcy imaging in living cells should find applications in imaging and biomedical fields.