bluuebunny/crossref_metadata_2025_split huggingface dataset:
Regeneration of a Commercial Catalyst for the Dehydrogenation of Isobutane to Isobutene
Authors: Masoudian S. K. , Sadighi S. , Abbasi A. , Salehirad F. , Fazlollahi A. 
Published: August 2013

AbstractIn the chemical and petrochemical industries, dehydrogenating of hydrocarbons to olefins as raw materials for the manufacture of various chemical products is an important economic issue. So, here, the redispersion and regeneration of a commercial Pt‐Sn/γ‐Al2O3 catalyst utilized for the conversion of isobutane to isobutene was studied. First, in order to regenerate the deactivated commercial catalyst unloaded from a commercial reactor, coke burning under controlled conditions was carried out. Then, to redisperse the platinum on the surface of the catalyst, a HCl solution (injected through a syringe pump) and Cl2 were passed over the catalytic bed at specific flow rates and temperatures. Evaluation tests carried out over the regenerated catalyst prove that the regenerated catalyst has similar conversion, selectivity, and structural characteristics as compared to the fresh one.
Reversible Control over Molecular Recognition in Surface‐Bound Photoswitchable Hydrogen‐Bonding Receptors: Towards Read–Write–Erase Molecular Printboards
Authors: Liang Chih‐Kai , Dubacheva Galina V. , Buffeteau Thierry , Cavagnat Dominique , Hapiot Philippe , Fabre Bruno , Tucker James H. R. , Bassani Dario M. 
Published: August 2013

AbstractThe synthesis of an anthracene‐bearing photoactive barbituric acid receptor and its subsequent grafting onto azide‐terminated alkanethiol/Au self‐assembled monolayers by using an CuI‐catalyzed azide–alkyne reaction is reported. Monolayer characterization using contact‐angle measurements, electrochemistry, and spectroscopic ellipsometry indicate that the monolayer conversion is fast and complete. Irradiation of the receptor leads to photodimerization of the anthracenes, which induces the open‐to‐closed gating of the receptor by blocking access to the binding site. The process is thermally reversible, and polarization‐modulated IR reflection–absorption spectroscopy indicates that photochemical closure and thermal opening of the surface‐bound receptors occur in 70 and 100 % conversion, respectively. Affinity of the open and closed surface‐bound receptor was characterized by using force spectroscopy with a barbituric‐acid‐modified atomic force microscope tip.
ChemInform Abstract: Crystal Growth and Real Structure Effects of the First Weak 3D Stacked Topological Insulator Bi14Rh3I9.
Authors: Rasche Bertold , Isaeva Anna , Gerisch Alexander , Kaiser Martin , Van den Broek Wouter , Koch Christoph T. , Kaiser Ute , Ruck Michael 
Published: August 2013

AbstractMicrocrystalline Bi14Rh3I9 is obtained by annealing a mixture of Bi, Rh, and BiI3 in the molar ratio of 11:3:3 (evacuated silica ampule, 365 °C, 3 d; 97% yield).
ChemInform Abstract: Cation, Vacancy, and Spin Ordered 15R‐Superstructures in Sr(Cr1‐xFex)O3‐y (0.4 ≤ x ≤ 0.6) Perovskites.
Authors: Arevalo‐Lopez Angel M. , Sher Falak , Farnham James , Watson Adam J. , Attfield J. Paul 
Published: August 2013

AbstractSr(Cr1‐xFex)O3‐y perovskites (0.2 ≤ x ≤ 0.8) are prepared by solid state reaction of stoichiometric mixtures of SrCO3, Fe2O3, and Cr2O3 (argon atmosphere, 1200 °C, 24 h, quenching in liquid N2).
ChemInform Abstract: Synthesis and Crystal Structure Determination of Ag9FeS4.1Te1.9, the First Example of an Iron Containing Argyrodite.
Authors: Frank Dominik , Gerke Birgit , Eul Matthias , Poettgen Rainer , Pfitzner Arno 
Published: August 2013

AbstractAg9FeS4.1Te1.9 is prepared by solid state reaction of stoichiometric amounts of the elements (evacuated quartz ampoule, 873 K, 2 weeks).
ChemInform Abstract: Nb2OsB2, with a New Twofold Superstructure of the U3Si2 Type: Synthesis, Crystal Chemistry and Chemical Bonding.
Authors: Mbarki Mohammed , Touzani Rachid St. , Fokwa Boniface P. T. 
Published: August 2013

AbstractThe new title compound is synthesized by arc melting of the elements in a water‐cooled Cu crucible under argon (ratio 7:6:8 for Nb:Os:B, 80% yield).
ChemInform Abstract: Magnesium—Tartramide Complex Mediated Asymmetric Strecker‐Type Reaction of Nitrones Using Cyanohydrin
Authors: Sakai Takahiro , Soeta Takahiro , Endo Kohei , Fujinami Shuhei , Ukaji Yutaka 
Published: August 2013

Abstractas a source of HCN
ChemInform Abstract: Bimetallic Enantioselective Approach to Axially Chiral Allenes.
Authors: Ma Shengming , et al. et al. 
Published: August 2013

AbstractThe reaction proceeds via an intermediate formation of the propargylic amines with CuBr catalyzing this step and combination of CuBr and ZnBr2 being responsible for the transformation of the intermediate to allenes.
ChemInform Abstract: Metal and H2O2 Free Aerobic Oxidative Aromatic Halogenation with [RNH3+] [NO3‐]/HX and ([BMIM(SO3H)][NO3)x(X)y] (X: Br, Cl) as Multifunctional Ionic Liquids.
Authors: Prebil Rok , Laali Kenneth K. , Stavber Stojan 
Published: August 2013

AbstractNovel multifunctional ionic liquids are generated by addition of HBr or HCl to alkylammonium nitrates and to 3‐methyl‐1‐(butyl‐4‐sulfonyl)imidazolium salts.
ChemInform Abstract: Practical Enantioselective Arylation and Heteroarylation of Aldehydes with in situ Prepared Organotitanium Reagents Catalyzed by 3‐Aryl‐H8‐BINOL‐Derived Titanium Complexes.
Authors: Uenishi Ami , Nakagawa Yuya , Osumi Hironobu , Harada Toshiro 
Published: August 2013

AbstractThe developed highly efficient title reaction affords a wide range of different substituted chiral alcohols.
ChemInform Abstract: NBS‐Initiated Electrophilic Phenoxyetherification of Olefins.
Authors: Ke Zhihai , Yeung Ying‐Yeung 
Published: August 2013

AbstractA one‐pot electrophilic multicomponent phenoxyetherification using an olefin, a cyclic ether, a phenol, and NBS is developed.
ChemInform Abstract: A Phosphane‐Free, Atom‐Efficient Cross‐Coupling Reaction of Triarylbismuths with Acyl Chlorides Catalyzed by MCM‐41‐Immobilized Palladium Complex.
Authors: Zhao Hong , Yin Lin , Cai Mingzhong 
Published: August 2013

AbstractThe catalyst can be reused at least 10 times without any significant decrease in activity.
ChemInform Abstract: Regio‐ and Chemoselective C—H Chlorination/Bromination of Electron‐Deficient Arenes by Weak Coordination and Study of Relative Directing‐Group Abilities.
Authors: Sun Xiuyun , Shan Gang , Sun Yonghui , Rao Yu 
Published: August 2013

AbstractThe novel and scalable ortho‐chlorination/bromination reaction can be applied for the synthesis of a broad range of arene chlorides and bromides.
ChemInform Abstract: Influence of an Internal Trifluoromethyl Group on the Rhodium(II)‐Catalyzed Reactions of Vinyldiazocarbonyl Compounds.
Authors: Nikolaev Valerij A. , Supurgibekov Murat B. , Davies Huw M. L. , Sieler Joachim , Zakharova Valerija M. 
Published: August 2013

AbstractIncorporation of a trifluoromethyl group into the starting compounds strongly reduces the tendency of intermediate vinyloxocarbenoids to undergo intermolecular reactions.
ChemInform Abstract: Palladium‐Catalyzed Cascade Reactions of 1‐(3‐Arylprop‐2‐ynyloxy)‐2‐bromo Benzene Derivatives with Organoboron Compounds.
Authors: Arcadi Antonio , Blesi Federico , Cacchi Sandro , Fabrizi Giancarlo , Goggiamani Antonella , Marinelli Fabio 
Published: August 2013

AbstractThe methodology allows a new access to various 2‐unsubstituted, 3‐functionalized benzofuran skeletons.
ChemInform Abstract: N‐Indolyltriethylborate: A Useful Reagent for Synthesis of C3‐Quaternary Indolenines.
Authors: Lin Aijun , Yang Jiong , Hashim Mohamed 
Published: August 2013

AbstractN‐Indolyltriethylborate is found to be a useful reagent for dearomatizing C3‐alkylation of 3‐substituted indoles with alkyl halides.
ChemInform Abstract: Enantioselective Friedel—Crafts Alkylation of Indoles with (E)‐1‐Aryl‐4‐benzyloxybut‐2‐en‐1‐ones Catalyzed by an (R)‐3,3′‐Br2BINOLate—Hafnium(IV) Complex.
Authors: Blay Gonzalo , Fernandez Isabel , Munoz M. Carmen , Pedro Jose R. , Vila Carlos 
Published: August 2013

AbstractThis method uses N‐unprotected indoles.
ChemInform Abstract: Silver‐Catalyzed Enantioselective Desymmetrization: Facile Access to Spirolactone‐Pyrrolidines Containing a Spiro Quaternary Stereogenic Center.
Authors: Liu Kang , Teng Huai‐Long , Yao Lu , Tao Hai‐Yan , Wang Chun‐Jiang 
Published: August 2013

AbstractThe title method represents the first catalytic asymmetric synthesis of highly functional spirolactonepyrrolidine derivatives bearing five contiguous stereocenters and one unique spiro quaternary stereocenter.
ChemInform Abstract: Nucleophile‐Dependent Regioselective Reaction of (S)‐4‐Benzyl‐2‐fluoroalkyl‐1,3‐oxazolines.
Authors: Jiang Haizhen , et al. et al. 
Published: August 2013

AbstractSubstituted oxazolines, oxazolidines, or fluorinated acetamides are obtained depending on the nucleophile used.
ChemInform Abstract: Palladium‐Catalyzed ortho‐Aroylation of 2‐Arylbenzothiazoles and 2‐Arylbenzoxazoles with Aldehydes.
Authors: Banerjee Arghya , Santra Sourav Kumar , Guin Srimanta , Rout Saroj Kumar , Patel Bhisma K. 
Published: August 2013

AbstractThis reaction has high regioselectivities and tolerates a wide range of functional groups.
ChemInform Abstract: Reductive Homocondensation of Benzylidene‐ and Alkylidenepyruvate Esters by a P(NMe2)3‐Mediated Tandem Reaction.
Authors: Wang Sunewang Rixin , Radosevich Alexander T. 
Published: August 2013

AbstractA P(III)‐mediated trimerization of unsaturated keto esters to diverse oxygenated heterocycles is reported.
ChemInform Abstract: Cu/SiO2: A Recyclable Catalyst for the Synthesis of Octahydroquinazolinone.
Authors: Heravi Majid M. , Karimi Narges , Hamidi Hoda , Oskooie Hossein A. 
Published: August 2013

AbstractA simple one‐pot three‐component condensation allows the access to the desired heterocyclic scaffold in a short time and with high yields.
ChemInform Abstract: Cooperative Iron—Broensted Acid Catalysis: Enantioselective Hydrogenation of Quinoxalines and 2H‐1,4‐Benzoxazines.
Authors: Fleischer Steffen , Zhou Shaolin , Werkmeister Svenja , Junge Kathrin , Beller Matthias 
Published: August 2013

AbstractAmong the agents tested, chiral acids (I) and iron complex IIC are found to be the most efficient ones for the title reactions and the reductive amination investigated for the preparation of (Va).
ChemInform Abstract: Copper‐Catalyzed C—N Bond Formation/Rearrangement Sequence: Synthesis of 4H‐3,1‐Benzoxazin‐4‐ones.
Authors: Ge Zhi‐Yuan , Xu Qiong‐Ming , Fei Xiang‐Dong , Tang Ting , Zhu Yong‐Ming , Ji Shun‐Jun 
Published: August 2013

Abstractas potential biologically important agents
ChemInform Abstract: Highly Enantioselective [3 + 2] Annulation of Cyclic Enol Silyl Ethers with Donor—Acceptor Cyclopropanes: Accessing 3a‐Hydroxy [n.3.0]Carbobicycles.
Authors: Xu Hao , Qu Jian‐Ping , Liao Saihu , Xiong Hu , Tang Yong 
Published: August 2013

AbstractThis is the first [3 + 2] annulation of enol silyl ethers with cyclopropanes.
ChemInform Abstract: Palladium(II)‐Catalyzed ortho‐Olefination of Benzylic Phosphonic Monoesters.
Authors: Meng Xiangjiang , Kim Sunggak 
Published: August 2013

AbstractA method for direct ortho‐olefination of benzylic phosphonates based on Pd(II)‐catalyzed C—H activation reactions using the phosphoryloxy directing group is described.
ChemInform Abstract: Synthesis of Alkynylated Selenophenes by Site‐Selective Sonogashira Reactions of Tetrabromoselenophene.
Authors: Ehlers Peter , Dang Tung T. , Patonay Tamas , Villinger Alexander , Langer Peter 
Published: August 2013

AbstractThis method can also be combined with Suzuki reactions to give access to other tetrasubstituted selenophenes, e.
ChemInform Abstract: A New Bioactive Ursane‐Type Triterpenoid from Croton bonplandianum Bail.
Authors: Ghosh Pranab , Mandal Amitava , Rasul Mohammad Golam 
Published: August 2013

AbstractNew triterpernoid 3α‐hydroxy‐urs‐12,15‐diene (I) is isolated together with three known compounds.
ChemInform Abstract: Caulerprenylols A and B, Two Rare Antifungal Prenylated para‐Xylenes from the Green Alga Caulerpa racemosa.
Authors: Mao Shui‐Chun , et al. et al. 
Published: August 2013

AbstractTitle compounds [(I) and (II)] exhibit a broad spectrum of antifungal activity against C.
ChemInform Abstract: Fast, High Yield, and High Solid Loading Synthesis of Metal Selenide Nanocrystals.
Authors: Flamee Stijn , Cirillo Marco , Abe Sofie , De Nolf Kim , Gomes Raquel , Aubert Tangi , Hens Zeger 
Published: August 2013

AbstractThe synthesis of metal selenide nanocrystals based on the injection of selenium powder in a hot mixture containing the metal cation precursor complexed by a carboxylic acid is demonstrated by the formation of CdSe and ZnSe nanocrystals.
ChemInform Abstract: A Drug Mystery of Heterocycles: Various Molecules for One Target or One Compound for Multiple Targets?
Authors: Shcherkakova I. 
Published: August 2013

AbstractReview: [design, development, and biological evaluation of a multitarget series of tetrahydroindolo[2,3‐c]quinolinones based on the “old” drug ambocarb; 109 refs.].
ChemInform Abstract: Catalysis of Organic Reactions by Carbenes and Carbene Complexes
Authors: Korotkikh N. I. , Saberov V. Sh. , Glinyanaya N. V. , Marichev K. A. , Kiselyov A. V. , Knishevitsky A. V. , Rayenko G. F. , Shvaika O. P. 
Published: August 2013

AbstractReview: 70 refs.
Early NT‐proBNP Decrease With Ivabradine in Ambulatory Patients With Systolic Heart Failure
Authors: Sargento Luis , Satendra Milan , Longo Susana , Lousada Nuno , Palma dos Reis Roberto 
Published: August 2013

AbstractBackgroundHeart rate (HR) reduction in patients with systolic heart failure (HF) is a cornerstone of current therapy. The aim of this study was to evaluate the short‐term effect of the HR reduction with ivabradine on N‐terminal pro‐brain natriuretic peptide (NT‐proBNP) in outpatients with systolic HF.HypothesisIvabradine improves survival and promotes left ventricle remodelling by reducing resting heart rate. Nt‐ProBNP absolute and trends predict prognosis. We hypothesized a possible association between heart rate decrease and Nt‐ProBNP values.MethodsWe included 25 outpatients with systolic HF on optimized medical therapy (80% on angiotensin‐converting enzyme inhibitors, 56% on spironolactone, and 88% on β‐blocker therapy), left ventricle ejection fraction <40%, and sinus rhythm and HR >70/bpm. After a 1 month running‐out period, to establish the clinical and NT‐proBNP stability, patients were started on ivabradine for 3 months.ResultsIvabradine decreased NT‐proBNP (P = 0.002) from a median of 2850 pg/mL to 1802 pg/mL, corresponding to a median absolute and percent decrease of 964 pg/mL and 44.5%, respectively. The baseline HR correlated significantly with the baseline NT‐proBNP (rs = 0.411, P = 0.041). The absolute and percent HR decrease correlated with the absolute NT‐proBNP decrease (rs = 0.442, P = 0.027; rs = 0.395, P = 0.05). The greater the NT‐proBNP absolute decrease tertile, the greater the baseline HR (P = 0.023) and the absolute (P = 0.028) and percent (P = 0.064) HR variation.ConclusionsIn outpatients with systolic HF, the NT‐proBNP reduction obtained by short‐term ivabradine treatment correlates closely with the degree of HR reduction.
Inhibition of Human α‐Methylacyl CoA Racemase (AMACR): a Target for Prostate Cancer
Authors: Carnell Andrew J. , Kirk Ralph , Smith Matthew , McKenna Shane , Lian Lu‐Yun , Gibson Robert 
Published: August 2013

AbstractThe enzyme α‐methylacyl CoA racemase (AMACR) is involved in the metabolism of branched‐chain fatty acids and has been identified as a promising therapeutic target for prostate cancer. By using the recently available human AMACR from HEK293 kidney cell cultures, we tested a series of new rationally designed inhibitors to determine the structural requirements in the acyl component. An N‐methylthiocarbamate (Ki=98 nM), designed to mimic the proposed enzyme‐bound enolate, was found to be the most potent AMACR inhibitor reported to date.
All‐Metal Clusters that Mimic the Chemistry of Halogens
Authors: Zhao Tianshan , Li Yawei , Wang Qian , Jena Puru 
Published: August 2013

AbstractOwing to their s2p5 electronic configuration, halogen atoms are highly electronegative and constitute the anionic components of salts. Whereas clusters that contain no halogen atoms, such as AlH4, mimic the chemistry of halogens and readily form salts (e.g., Na+(AlH4)−), clusters that are solely composed of metal atoms and yet behave in the same manner as a halogen are rare. Because coinage‐metal atoms (Cu, Ag, and Au) only have one valence electron in their outermost electronic shell, as in H, we examined the possibility that, on interacting with Al, in particular as AlX4 (X=Cu, Ag, Au), these metal atoms may exhibit halogen‐like properties. By using density functional theory, we show that AlAu4 not only mimics the chemistry of halogens, but also, with a vertical detachment energy (VDE) of 3.98 eV in its anionic form, is a superhalogen. Similarly, analogous to XHX superhalogens (X=F, Cl, Br), XAuX species with VDEs of 4.65, 4.50, and 4.34 eV in their anionic form, respectively, also form superhalogens. In addition, Au can also form hyperhalogens, a recently discovered species that show electron affinities (EAs) that are even higher than those of their corresponding superhalogen building blocks. For example, the VDEs of M(AlAu4)2− (M=Na and K) and anionic (FAuF)Au(FAuF) range from 4.06 to 5.70 eV. Au‐based superhalogen anions, such as AlAu4− and AuF2−, have the additional advantage that they exhibit wider optical absorption ranges than their H‐based analogues, AlH4− and HF2−. Because of the catalytic properties and the biocompatibility of Au, Au‐based superhalogens may be multifunctional. However, similar studies that were carried out for Cu and Ag atoms have shown that, unlike AlAu4, AlX4 (X=Cu, Ag) clusters are not superhalogens, a property that can be attributed to the large EA of the Au atom.
Syntheses of LiCoO2 Mesocrystals by Topotactic Transformation and Their Electrochemical Properties
Authors: Nakajima Keisuke , Oaki Yuya , Imai Hiroaki 
Published: August 2013

AbstractSynthetic routes for LiCoO2 mesocrystals with porous and single‐crystalline structures through the topotactic transformation of precursor crystals are developed. Octahedral LiCoO2 frameworks of 4–6 μm in diameter, consisting of 600–800 nm subunits, are obtained from octahedral solid particles of Co2(OH)3Cl. Hollow LiCoO2 plates about 600 nm wide and 40 nm thick composed of 100–400 nm subunits are produced from hexagonal disks of β‐Co(OH)2. The LiCoO2 mesocrystals exhibit enhanced charge–discharge cycle stability and rate performance as a cathode material for lithium‐ion batteries. The high reactive surface area, owing to the porous framework, and high lithium‐ion and electron conductivities, originating from the single‐crystalline nature, effectively enhance their electrochemical properties.
Three‐Dimensional Superwetting Mesh Film Based On Graphene Assembly for Liquid Transportation and Selective Absorption
Authors: Sun Hanxue , Li An , Qin Xiaojuan , Zhu Zhaoqi , Liang Weidong , An Jin , La Peiqing , Deng Weiqiao 
Published: August 2013

AbstractSuperwetting membranes or porous absorbent materials have recently attracted considerable interest from both commercial and academic communities due to their excellent performance for separation or selective absorption of organic compounds and oils from water, which shows great potential for addressing environmental issues. Herein, the first example of engineering a commercially available stainless‐steel grid based on the assembly of graphene for the fabrication of superwetting mesh films (SMFs) is reported. An excellent surface wettability of the SMFs, which exhibit a unique adhesion force to liquids, is observed; this makes it possible to transfer small quantities of liquid samples to perform microsample analysis. A three‐dimensional SMF shows unprecedented performance in the separation, transportation, and selective absorption of organic compounds or oils from water. The performance is considerably improved in comparison to traditional separation/absorption technologies and may useful for a wide range of applications such as purification, water treatment, or oil‐spill cleanup.
Security analysis of an authentication and key agreement protocol for satellite communications
Authors: Zhang Yuanyuan , Chen Jianhua , Huang Baojun 
Published: August 2013

SUMMARYRecently, Chang et al. proposed an authentication and key agreement protocol for satellite communications, and they claimed that their scheme could withstand various attacks. However, in this paper, we will show that their scheme is vulnerable to the denial of service attack and the impersonation attack. Moreover, we also point out that the adversary could compute the session key through the intercepted message. The analysis shows the scheme of Chang et al. is not secure for practical applications. Copyright © 2013 John Wiley & Sons, Ltd.
Direct detection OFDMA‐PON based on optical single sideband modulation and polarisation multiplexing
Authors: Yu Song , Yang Zhanyu , Lan Mingying , Lu Jianhao , Li Jian , Wu Guohua , Gu Wanyi 
Published: August 2013

AbstractA low complexity scheme is proposed for direct detection orthogonal frequency division multiple access passive optical network, based on optical single sideband modulation and polarisation multiplexing. By utilising Hermitian symmetry mapping and Hilbert transformation, the hardware requirement is reduced. Theoretical expressions are presented to explain the cross‐polarisation interference, and a channel estimation algorithm is proposed for polarisation crosstalk. In addition, system parameters are discussed to optimise the performance of the proposed scheme. Copyright © 2013 John Wiley & Sons, Ltd.
Performance evaluation of cooperative strategies for Vehicular Delay‐Tolerant Networks
Authors: Dias João A.F.F. , Rodrigues Joel J.P C. , Zhou Liang 
Published: August 2013

ABSTRACTVehicular Delay‐Tolerant Networks emerge as a vehicular networks technology that can be deployed on a wide range of scenarios. For example, it can be applied in sparse and remote regions characterised by sparse connectivity to allow data communications, as well as in urban scenarios. Frequent network partitioning, intermittent connectivity, long propagation delays, high error rates and short contact durations characterise these environments. To overcome some of these issues, cooperation approaches should be considered to force nodes to share their own resources. It is important to perform this task because nodes may be unwilling to cooperate due to a selfish behaviour. Selfish nodes affect considerably the functionality and the performance of the overall network. This paper overviews the most relevant contributions on cooperation for vehicular networks. It also proposes four different cooperation strategies for Vehicular Delay‐Tolerant Networks and studies their impact on the performance of the network. These strategies are enforced on two delay‐tolerant networks routing protocols (Epidemic and Spray‐and‐Wait). Across all the experiments, it was shown that all the strategies contribute to the improvement of the overall network performance by increasing the bundle delivery probability and consequently decrease the bundle average delivery delay. Copyright © 2013 John Wiley & Sons, Ltd.