bluuebunny/crossref_metadata_2025_split huggingface dataset:
Donor–Acceptor Oligorotaxanes Made to Order
Authors: Basu Subhadeep , Coskun Ali , Friedman Douglas C. , Olson Mark A. , Benítez Diego , Tkatchouk Ekaterina , Barin Gokhan , Yang Jeffrey , Fahrenbach Albert C. , Goddard William A. , Stoddart J. Fraser 
Published: January 2011

AbstractFive donor–acceptor oligorotaxanes made up of dumbbells composed of tetraethylene glycol chains, interspersed with three and five 1,5‐dioxynaphthalene units, and terminated by 2,6‐diisopropylphenoxy stoppers, have been prepared by the threading of discrete numbers of cyclobis(paraquat‐p‐phenylene) rings, followed by a kinetically controlled stoppering protocol that relies on click chemistry. The well‐known copper(I)‐catalyzed alkyne–azide cycloaddition between azide functions placed at the ends of the polyether chains and alkyne‐bearing stopper precursors was employed during the final kinetically controlled template‐directed synthesis of the five oligorotaxanes, which were characterized subsequently by 1H NMR spectroscopy at low temperature (233 K) in deuterated acetonitrile. The secondary structures, as well as the conformations, of the five oligorotaxanes were unraveled by spectroscopic comparison with the dumbbell and ring components. By focusing attention on the changes in chemical shifts of some key probe protons, obtained from a wide range of low‐temperature spectra, a picture emerges of a high degree of folding within the thread protons of the dumbbells of four of the five oligorotaxanes—the fifth oligorotaxane represents a control compound in effect—brought about by a combination of CH⋅⋅⋅O and π–π stacking interactions between the π‐electron‐deficient bipyridinium units in the rings and the π‐electron‐rich 1,5‐dioxynaphthalene units and polyether chains in the dumbbells. The secondary structures of a foldamer‐like nature have received further support from a solid‐state superstructure of a related [3]pseudorotaxane and density functional calculations performed thereon.
ChemInform Abstract: Rhombohedrally Distorted γ‐Brasses Cr1‐xFexGa.
Authors: Ko Hyunjin , Gourdon Olivier , Gout Delphine , Mun Eun‐Deok , Thimmaiah Srinivasa , Miller Gordon J. 
Published: January 2011

AbstractThe title compounds are characterized by EDS, powder and single crystal XRD, neutron powder diffraction (Cr0.5Fe0.5Ga), magnetic measurements, and TB‐LMTO electronic structure calculations.
ChemInform Abstract: Hydrothermal Crystal Growth of the Potassium Niobate and Potassium Tantalate Family of Crystals.
Authors: Mann Matthew , Jackson Summer , Kolis Joseph 
Published: January 2011

AbstractKNbO3 (I), KTaO3 (II), and KTa0.56Nb0.44O3 (III) are prepared by solid state reactions of appropriate mixtures of K2CO3 and Ta2O5 and/or Nb2O5 (950 °C, 72 h).
ChemInform Abstract: B‐Site Ordered Perovskite LaSrMnNbO6: Synthesis, Structure and Antiferromagnetism.
Authors: Yang Tao , Perkisas Tyche , Hadermann Joke , Croft Mark , Ignatov Alexander , Greenblatt Martha 
Published: January 2011

AbstractThe title compound is prepared by solid state reaction of stoichiometric amounts of La2O3, SrCO3, Mn2O3, and Nb2O5 (1% H2/Ar dynamic flow, 1275 °C, 120 h).
ChemInform Abstract: Crystal Structure and Physical Properties of the New Antimonide Hf3Cu2Ge3.58Sb1.42.
Authors: Guch Mykhailo , Sankar Cheriyedath Raj , Assoud Abdeljalil , Kleinke Holger 
Published: January 2011

AbstractThe new title compound is synthesized by arc melting of a mixture of Hf, Cu, and Ge (3:2:3.58) and subsequent reaction with Sb (1323 K, 12 h).
ChemInform Abstract: New Chiral Ligands Based on (+)‐α‐Pinene.
Authors: Koneva E. A. , Korchagina D. V. , Gatilov Yu. V. , Genaev A. M. , Krysin A. P. , Volcho K. P. , Tolstikov A. G. , Salakhutdinov N. F. 
Published: January 2011

AbstractA range of novel chiral Schiff base and amine compounds based on α‐pinene is synthesized and used as ligands in the vanadium‐catalyzed asymmetric oxidation of thioanisole (III).
ChemInform Abstract: A Facile Synthesis of Substituted Indenones and Piperidine‐2,6‐diones from the Baylis—Hillman Acetates.
Authors: Basavaiah Deevi , Lenin Dandamudi V. 
Published: January 2011

AbstractTreatment of Baylis—Hillman acetates with diphenylacetonitrile (II) or phenylacetonitrile (X) provides access to the corresponding 2‐benzylidene‐4‐cyanobutanoates (III) and (XI), respectively.
ChemInform Abstract: Organocatalyzed Enantioselective Protonation of Silyl Enol Ethers: Scope, Limitations, and Application to the Preparation of Enantioenriched Homoisoflavones.
Authors: Poisson Thomas , Gembus Vincent , Dalla Vincent , Oudeyer Sylvain , Levacher Vincent 
Published: January 2011

AbstractIn the presence of Ph‐CO‐F/EtOH and (DHQ)2‐AQN, silyl enol ethers smoothly undergo enantioselective protonation giving chiral ketones with up to 92% e.e..
ChemInform Abstract: Oxidation of Alkanols with CeIII—LiBr—H2O2 System.
Authors: Nikishin G. I. , Sokova L. L. , Kapustina N. I. 
Published: January 2011

AbstractOxidation of primary and secondary alkanols to esters and ketones, resp., is achieved using a Ce(NO3)2—LiBr—H2O2 systems.
ChemInform Abstract: Nonafluorobutanesulfonyl Azide: A Shelf‐Stable Diazo Transfer Reagent for the Synthesis of Azides from Primary Amines.
Authors: Suarez Jose Ramon , Trastoy Beatriz , Perez‐Ojeda M. Eugenia , Marin‐Barrios Ruben , Chiara Jose Luis 
Published: January 2011

AbstractThe title reagent is also successfully applied to the one‐pot regioselective synthesis of 1,2,3‐triazoles by a subsequent inter‐ or intramolecular azide—alkyne 1,3‐dipolar cycloaddition reaction.
ChemInform Abstract: Iron‐Catalyzed ortho‐Selective Functionalization of Phenols: A Straightforward Strategy Towards the 2′‐Hydroxyphenyl‐1,2‐dione Skeleton.
Authors: Guo Xingwei , Li Wenjuan , Li Zhiping 
Published: January 2011

AbstractThe reactions of simple phenols with α‐hydroxy ketones provide a novel and efficient method to construct 2′‐hydroxyphenyl‐1,2‐dione derivatives such as (III) and (V) or the cyclized analogue (VII).
ChemInform Abstract: Stereoselective Negishi‐Like Couplings Between Alkenyl and Alkyl Halides in Water at Room Temperature.
Authors: Krasovskiy Arkady , Duplais Christophe , Lipshutz Bruce H. 
Published: January 2011

AbstractThe procedure is very simple and the reaction proceeds mostly with retention of the stereoconfiguration of the alkenes.
ChemInform Abstract: Stereoselective Synthesis of Cyclohexanones via Phase Transfer Catalyzed Double Addition of Nucleophiles to Divinyl Ketones.
Authors: Silvanus Andrew C. , Groombridge Benjamin J. , Andrews Benjamin I. , Kociok‐Koehn Gabriele , Carbery David R. 
Published: January 2011

AbstractA simple and diastereoselective method to prepare functionalized cyclohexanones is reported.
ChemInform Abstract: Hydrosilylation of Ketones: From Metal—Organic Frameworks to Simple Base Catalysts.
Authors: Addis Daniele , Zhou Shaolin , Das Shoubhik , Junge Kathrin , Kosslick Hendrik , Harloff Joerg , Lund Henrik , Schulz Axel , Beller Matthias 
Published: January 2011

AbstractThe remarkably simple method for hydrosilylation/desilylation of a variety of aromatic ketones and aldehydes (V) uses the bases NaOH or (catalytic) KOtBu.
ChemInform Abstract: Enantioselective α‐Benzylation of Aldehydes via Photoredox Organocatalysis.
Authors: Shih Hui‐Wen , Vander Wal Mark N. , Grange Rebecca L. , MacMillan David W. C. 
Published: January 2011

AbstractThe first enantioselective α‐benzylation of aldehydes with electron‐deficient aryl and heteroaryl substrates proceeds in the presence of a chiral imidazolidinone organocatalyst, an iridium photoredox catalyst, and in the presence of household fluorescent light.
ChemInform Abstract: A Heterobimetallic Ni/La‐Salan Complex for Catalytic Asymmetric Decarboxylative 1,4‐Addition of Malonic Acid Half‐Thioester.
Authors: Furutachi Makoto , Mouri Shinsuke , Matsunaga Shigeki , Shibasaki Masakatsu 
Published: January 2011

AbstractThe method is applied to a wide range of aromatic and aliphatic nitroalkenes to afford the products with high yields and enantioselectivities.
ChemInform Abstract: Synthesis of Regioselectively Functionalized Pyrenes via Transition‐Metal‐Catalyzed Electrocyclization.
Authors: Walker D. Barney , Howgego Joshua , Davis Anthony P. 
Published: January 2011

AbstractThe synthesis of polyfunctionalized pyrenes (VII) and (IX) is based on cycloisomerization of diethynyl biphenyl precursors (VI) and (VIII) using either platinum or gold salts as catalysts.
ChemInform Abstract: Reaction of 4‐Oxocarboxylic Acids and 5‐Substituted 3H‐Furan‐2‐ones with 1,2‐Binucleophiles of Aromatic and Alicyclic Series.
Authors: Grinev V. S. , Amal'chieva O. A. , Egorova A. Yu. , Lyubun E. V. 
Published: January 2011

Abstract5‐Substituted furan‐2‐ones and their precursors, 4‐substituted 4‐oxocarboxylic acids, readily react with the title binucleophiles furnishing tricyclic azolidine structures.
ChemInform Abstract: Use of Molecular Oxygen as a Reoxidant in the Synthesis of 2‐Substituted Benzothiazoles via Palladium‐Catalyzed C—H Functionalization/Intramolecular C—S Bond Formation.
Authors: Inamoto Kiyofumi , Hasegawa Chisa , Kawasaki Junpei , Hiroya Kou , Doi Takayuki 
Published: January 2011

Abstract2‐Arylbenzothiazoles are formed by cyclization of thiobenzanilides under an O2 atmosphere in the presence of added CsF, which greatly enhances the cyclization reaction.
ChemInform Abstract: Substituted 3‐ and 5‐Formylpyridin‐2‐ones in the Synthesis of 1‐Aryl‐1,6‐naphthyridinone Derivatives.
Authors: Medvedeva M. I. , Tugusheva N. Z. , Alekseeva L. M. , Evstratova M. I. , Kiselev S. S. , Chernyshev V. V. , Avramenko G. V. , Granik V. G. 
Published: January 2011

AbstractAryl‐substituted formylpyridinones are synthesized from enaminoamides, and transformed into several different naphthyridinones as well as related tricyclic compounds.
ChemInform Abstract: Synthesis of 2‐Iminothiophen‐3(2H)‐ones from 3H‐1,2‐Dithiol‐3‐ones.
Authors: Ogurtsov Vladimir A. , Karpychev Yurii V. , Pestravkina Dar'ya A. , Belyakov Pavel A. , Nelyubina Yulia V. , Rakitin Oleg A. 
Published: January 2011

AbstractThe reaction of 3H‐1,2‐dithiol‐3‐ones of type (I), (IV), and (VII) with isonitriles yields the corresponding 2‐iminothiophen‐3(2H)‐ones.
ChemInform Abstract: Naphtho‐ and Benzo[g]quinoxalino‐Fused Oxazocinoquinolinones and Their Diaryl and Alkynyl Analogues from Quinolin‐8‐ols: A Library of Novel Polynuclear Heteroaromatics.
Authors: Paira Rupankar , Maity Arindam , Naskar Subhendu , Mondal Shyamal , Paira Priyankar , Hazra Abhijit , Sahu Krishnendu B. , Saha Pritam , Banerjee Sukdeb , Mondal Nirup B. 
Published: January 2011

AbstractA phase transfer promoted synthesis of halogen‐substituted title compounds such as (III) and (VIII) is described and their utility in Pd‐catalyzed coupling reactions is demonstrated.
ChemInform Abstract: Two New Drimane Sesquiterpenoids from Compound Changweikang and Their Inhibitory Activity Against Nitric Oxide Production.
Authors: Liu Ming‐sheng , Liu Chang , Zhang Xiao‐po , Sheng Lin , Zhang Jun‐qing , Kang Sheng‐li 
Published: January 2011

AbstractThe new drimane sesquiterpenoids changweikangic acid A (I) and B (II) are isolated from the Chinese patent drug Compound Changweikang which is made from the aqueous extracts of two medicinal plants.
ChemInform Abstract: New 3β,5α,6β‐Trihydroxysteroids from the Octocorals Bebryce sp. (Plexauridae) and Carijoa sp. (Clavulariidae).
Authors: Sung Ping‐Jyun , Liu Chih‐Yang 
Published: January 2011

AbstractThe novel hydroxysteroids (I)—(III) are isolated from the freeze‐dried material of both marine species mentioned in the title.
ChemInform Abstract: Synthesis of N‐Heteroaryl Aminosaccharide Derivatives as Fibroblast Growth Factor 2 Signaling Modulators.
Authors: Dong Jin , Yao Shuowei , Zhou Xiaodong , Zhang Lijuan , Xu Yungen 
Published: January 2011

AbstractA series of N‐heteroaryl aminosaccharide derivatives is synthesized as small molecular heparin mimics.
ChemInform Abstract: New Xanthoquinodin‐Like Compounds, JBIR‐97, ‐98 and ‐99, Obtained from Marine Sponge‐Derived Fungus Tritirachium sp. SpB081112MEf2
Authors: Ueda Jun‐ya , Takagi Motoki , Shin‐ya Kazuo 
Published: January 2011

Abstractisolation, structure elucidation and biological activity of diastereomers JBIR‐97/98 (I) and JBIR‐99 (II)
ChemInform Abstract: A New 16‐Membered Tetraene Macrolide JBIR‐100 (I) from a Newly Identified Streptomyces Species.
Authors: Ueda Jun‐ya , Hashimoto Junko , Yamamura Hideki , Hayakawa Masayuki , Takagi Motoki , Shin‐ya Kazuo 
Published: January 2011

Abstractisolation, structure elucidation and cytotoxicity
ChemInform Abstract: Anticholinesterase and Antioxidant Constituents from Gloiopeltis furcata.
Authors: Fang Zhe , Jeong Su Yang , Jung Hyun Ah , Choi Jae Sue , Min Byung Sun , Woo Mi Hee 
Published: January 2011

AbstractActivity‐directed isolation results in the identification of compounds (I) and (II) as novel constituents of the title seaweed.
ChemInform Abstract: Supramolecular Surface‐Confined Architectures Created by Self‐Assembly of Triangular Phenylene—Ethynylene Macrocycles via van der Waals Interaction.
Authors: Tahara Kazukuni , Lei Shengbei , Adisoejoso Jinne , De Feyter Steven , Tobe Yoshito 
Published: January 2011

AbstractReview: 77 refs.
Switching rate and receiver performance of binary modulations with the selection‐and‐stay combining over independent and correlated Nakagami‐m fading channels
Authors: Chau Yawgeng A. , Chen Yao‐Hua 
Published: January 2011

AbstractThe dual‐branch selection‐and‐stay combining (SSTC) is analyzed for diversity reception on independent and correlated Nakagami‐m fading channels, where the conventional selection combining (SC) is employed only at the switching instance, and the receiver uses the selected branch till its signal‐to‐noise ratio (SNR) estimation is lower than a preset threshold. In this combining scheme, the receiver only needs to continuously estimate the SNR of the single selected branch. For the performance analysis of SSTC, the switching rate and the average bit error rates (BERs) of different binary coherent and non‐coherent modulations are evaluated. Numerical results based on the analysis and simulations are illustrated. According to the analysis and numerical results, the SSTC outperforms the existing switch‐and‐stay combining in the senses of the average BER and switching rate. Copyright © 2011 John Wiley & Sons, Ltd.
Modeling TCP SACK performance over wireless channels with completely reliable ARQ/FEC
Authors: Dunaytsev Roman , Moltchanov Dmitri , Koucheryavy Yevgeni , Harju Jarmo 
Published: January 2011

AbstractIn this paper, we propose an analytical cross‐layer model for a Transmission Control Protocol (TCP) connection running over a covariance‐stationary wireless channel with a completely reliable Automatic Repeat reQuest scheme combined with Forward Error Correction (FEC) coding. Since backbone networks today are highly overprovisioned, we assume that the wireless channel is the only one bottleneck in the system which causes packets to be buffered at the wired/wireless interface and dropped as a result of buffer overflow. We develop the model in two steps. At the first step, we consider the service process of the wireless channel and derive the probability distribution of the time required to successfully transmit an IP packet over the wireless channel. This distribution is used at the next step of the modeling, where we derive expressions for the TCP long‐term steady‐state throughput, the mean round‐trip time, and the spurious timeout probability. The developed model allows to quantify the joint effect of many implementation‐specific parameters on the TCP performance over both correlated and non‐correlated wireless channels. We also demonstrate that TCP spurious timeouts, reported in some empirical studies, do not occur when wireless channel conditions are covariance‐stationary and their presence in those measurements should be attributed to non‐stationary behavior of the wireless channel characteristics. Copyright © 2011 John Wiley & Sons, Ltd.
Effectiveness of server load estimation by using requested file size for web server clusters
Authors: Satake Shinsuke , Inai Hiroshi , Arai Tsuyoshi 
Published: January 2011

AbstractSeveral dynamic load‐balancing methods for web server clusters have been proposed. In order to realize effective load‐balancing, they have required almost real‐time server load information, which could be obtained by observation of client server interactions or by frequent polling from the load‐balancer (dispatcher) to each server. However, observation provides indirect server load information and the polling interval produces a time lag. To overcome that problem, this paper proposes a load‐balancing method based on server load estimation. Under our method, the load‐balancer selects the estimated least‐loaded server, then delivers arriving requests to that server. The estimation is based on the fact that the file transfer delay is proportional to the file size. The fact makes it possible to estimate the load on each server from the last request delivery time and the file size. A performance comparison with the previously proposed methods indicates that our method can achieve an effective load balancing of web server clusters. © 2011 Wiley Periodicals, Inc. Electron Comm Jpn, 94(2): 59–66, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.10274
Estimation of metabolic characteristics of heat‐injured bacteria by dielectrophoretic impedance measurement
Authors: Amako Eri , Enjoji Takaharu , Uchida Satoshi , Tochikubo Fumiyoshi 
Published: January 2011

AbstractConstant monitoring and immediate control of fermentation processes have been required for advanced quality preservation in the food industry. In the present work, simple estimation of metabolic states for heat‐injured Escherichia coli in a micro‐cell was investigated by a dielectrophoretic impedance measurement (DEPIM) method. The temporal change in conductance across a micro‐gap (ΔG) was measured for various heat treatment temperatures. In addition, the dependence of the enzyme activity, growth capacity, and membrane situation for E. coli on the heat treatment temperature was also analyzed by conventional biological methods. Consequently, a correlation between ΔG and those biological properties was obtained quantitatively. This result suggests that the DEPIM method will be an effective technique for monitoring complex changes in various biological states of microorganisms. © 2011 Wiley Periodicals, Inc. Electron Comm Jpn, 94(2): 9–16, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.10321
Stability of networked control system with dynamic quantizer and data‐driven zero‐order hold
Authors: Konaka Eiji 
Published: January 2011

AbstractHigh‐speed communication networks, such as the Internet, have recently seen rapid development. This has facilitated the construction of control systems that employ these networks. However, these systems have two major problems: (i) bit rate limitation, and (ii) network unreliability, such as delays, data dropouts, etc. In this study, dynamic quantization is used to overcome the first problem. For the second problem, data‐driven zero‐order hold is used to suppress the effect of stochastic data dropout through an unreliable network. The stochastic stability of the system is analyzed and the sufficient condition for stability is derived in this study. Finally, the proposed method is validated through some experiments. © 2011 Wiley Periodicals, Inc. Electron Comm Jpn, 94(2): 1–8, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.10329
A Dinuclear Gold(I)–Silver(I) Derivative of 2‐Cyclopentylidene‐2‐sulfanylacetic Acid and Related Complexes: Synthesis, Crystal Structures, Properties and Antitumor Activity
Authors: Barreiro Elena , Casas José S. , Couce María D. , Laguna Antonio , López‐de‐Luzuriaga José M. , Monge Miguel , Sánchez Agustin , Sordo José , Varela José M. , López Ezequiel M. Vázquez 
Published: January 2011

AbstractThe dinuclear complex [AgAu(PPh3)2cpa] (H2cpa = 2‐cyclopentylidene‐2‐sulfanylacetic acid) was prepared by treating the precursor [Au(PPh3)(Hcpa)] with Ag(PPh3)NO3. The complex was characterised by spectroscopic methods (IR; 1H, 13C, 31P NMR) and mass spectrometry, and the structure was solved by a single‐crystal X‐ray diffraction study. Luminescence and theoretical studies were carried out, and the antitumor activity was studied in vitro against HeLa‐229, A2780 and A2780cis cell lines. The related gold(I)–gold(I), [(AuPPh3)2cpa], and silver(I)–silver(I), [(AgPPh3)2cpa], compounds were also prepared and studied in the solid state and in solution.
Immobilized DMAP Derivatives Rivaling Homogeneous DMAP
Authors: D'Elia Valerio , Liu Yinghao , Zipse Hendrik 
Published: January 2011

AbstractThe copper‐catalyzed Huisgen reaction between azides and alkynes was utilized to covalently attach derivatives of 4‐(dimethylamino)pyridine (DMAP) to a polystyrene resin (PS) support. The catalytic potential of these constructs as determined in acylation and aza‐Morita–Baylis–Hillman reactions far exceeds that of commercially available DMAP‐PS resins and is fully competitive with DMAP in homogeneous solution.
Tautomerism and the Protonation/Deprotonation of Isocytosine in Liquid‐ and Solid‐States Studied by NMR Spectroscopy and Theoretical Calculations
Authors: Dračínský Martin , Jansa Petr , Ahonen Kari , Buděšínský Miloš 
Published: January 2011

AbstractIsocytosine crystallizes as a 1:1 ratio of two tautomers in a manner similar to that of the guanine and cytosine pairs in DNA. The solid‐state NMR chemical shifts of crystalline neutral isocytosine, the sodium salt of isocytosine, and those of isocytosine hydrochloride were measured and related to the NMR parameters in aqueous and organic solutions. The experimental chemical shifts were compared with those calculated by three different methods: (1) calculations on isolated molecules, (2) calculations on isocytosine clusters of various sizes, and (3) infinite crystal calculations, that is, the gauge‐including projector‐augmented wave (GIPAW) method. The data obtained with the GIPAW method were in best agreement with the experimental data.
Full‐scale study on combustion characteristics of an upholstered chair under different boundary conditions—Part 2: Ignition at the backrest top
Authors: Xie Q. Y. , Zhang H. P. , Han Z. F. , Mei P. 
Published: January 2011

AbstractThe objective of this work is to investigate the effects of both boundary conditions and ignition positions on the combustion characteristic of a combustible item in a room. A series of full‐scale experiments were carried out in an ISO 9705 fire test room with an upholstered chair at three typical locations, i.e. the middle of side wall, room center and room corner. Here, ignition was achieved through a BS No. 7 wooden crib at the top of the backrest. The results show there were two peak heat release rates (HRRs) when the chair is at the room corner. However, when the chair was placed at the room center, only one peak HRR was observed. In addition, the peak HRR for the chair at the room center, about 800 kW, was much higher than that of the chair at the room corner, about 600 kW. Taken together with earlier work, in which the igniting crib was placed on the chair seat, the results show that the ignition positions, as well as the boundary conditions, influence the combustion behavior of upholstered furniture in a room. Finally, it is suggested that the chair burning would develop more slowly when it is ignited at the backrest than at the seat. Copyright © 2011 John Wiley & Sons, Ltd.