bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: BF3·OEt2‐Catalyzed Unusual Formation of cis‐2,3‐Disubstituted Tetrahydrofuran Scaffolds.
Authors: Reddy B. V. Subba , Anjum S. Rehana , Reddy G. Madhusudhan , Rao T. Prabhakar 
Published: March 2012

AbstractThe cyclization reaction of (E)‐olefins with aldehydes in the presence of BF3·OEt2 gives tetrahydrofuran derivatives (III) with all‐cis selectivity.
ChemInform Abstract: Organocatalytic Enantioselective Formal Synthesis of Bromopyrrole Alkaloids via Aza‐Michael Addition.
Authors: Lee Su‐Jeong , Youn Seok‐Ho , Cho Chang‐Woo 
Published: March 2012

AbstractAn enantioselective aza‐Michael addition to protected 4‐hydroxy butenal (II) using pyrroles (I) and (IV) as the N‐centered nucleophile is utilized to construct the nitrogen‐substituted stereogenic carbon center in bromopyrrole alkaloids.
ChemInform Abstract: The Chemistry of α,β‐Ditosyloxy Ketones: A New and Convenient Route to 4,5‐Diarylisoxazoles from α,β‐Chalcone Ditosylates.
Authors: Kamal Raj , Sharma Deepak , Wadhwa Deepak , Prakash Om 
Published: March 2012

AbstractThe reaction offers a novel route to 4,5‐diarylisoxazoles which cannot be obtained from the corresponding α,β‐dibromides.
ChemInform Abstract: Copper(II) Triflate Promoted One‐Pot Synthesis of Coumarin‐, Quinolone‐, and Naphthalene‐Annulated 2‐Aminothiazoles under Ligand‐Free Conditions.
Authors: Majumdar K. C. , De Nirupam , Ghosh Debankan , Ponra Sudipta , Roy B. 
Published: March 2012

AbstractA protocol to synthesize annulated 2‐aminothiazoles from ortho‐halogenated aminoarenes is developed using CS2 as one‐carbon source in the presence of Cu(II)‐catalyst.
ChemInform Abstract: Palladium‐Catalyzed Desulfitative C—H Arylation of Azoles with Sodium Sulfinates.
Authors: Chen Ru , Liu Saiwen , Liu Xinhua , Yang Luo , Deng Guo‐Jun 
Published: March 2012

AbstractA novel Pd‐catalyzed desulfitative direct arylation of azoles takes place in the presence of Cu(II) as an oxidant.
ChemInform Abstract: Tandem Knoevenagel‐[3 + 2] Cycloaddition—Elimination Reactions: One‐Pot Synthesis of 4,5‐Disubstituted 1,2,3‐(NH)‐Triazoles.
Authors: Ponpandian Thanasekaran , Muthusubramanian Shanmugam 
Published: March 2012

AbstractA large variety of triazoles is prepared by Knoevenagel condensation of aldehydes with active methylene compounds followed by 1,3‐dipolar cycloaddition with azide.
ChemInform Abstract: Stabilization of Cu(0)‐Nanoparticles into the Nanopores of Modified Montmorillonite: An Implication on the Catalytic Approach for “Click” Reaction Between Azides and Terminal Alkynes.
Authors: Borah Bibek Jyoti , Dutta Dipanka , Saikia Partha Pratim , Barua Nabin Chandra , Dutta Dipak Kumar 
Published: March 2012

AbstractThe reaction is carried out in water.
ChemInform Abstract: Synthesis of 5‐Alkyl‐2‐amino‐1,3,4‐thiadiazoles and α,ω‐Bis(2‐amino‐1,3,4‐thiadiazol‐5‐yl)alkanes in Ionic Liquids.
Authors: Epishina Margarita A. , Kulikov Alexander S. , Ignat'ev Nikolai V. , Schulte Michael , Makhova Nina N. 
Published: March 2012

AbstractBesides [emim]HSO4 several alternative ionic liquids are tested, but mostly in lower yields.
ChemInform Abstract: Convergent Synthesis of 2H‐Chromenes — A Formal [3 + 3] Cycloaddition by a One‐Pot, Three‐Step Cascade.
Authors: Parker Kathlyn A. , Mindt Thomas L. 
Published: March 2012

AbstractThe title reaction of several bromoquinones with vinylstannane (II) proceeds via the palladium‐catalyzed coupling, the HMPA‐promoted enolization of the formed vinylquinones, and the final thermal electrocyclization.
ChemInform Abstract: A More Efficient Synthesis of 4,4′,4′′‐Tricarboxy‐2,2′:6′,2′′‐terpyridine.
Authors: Dehaudt Jeremy , Husson Jerome , Guyard Laurent 
Published: March 2012

AbstractCompared to established routes to title compound (VI), the principles of green chemistry are applied because this new preparation generates less waste and avoids the use of hazardous chromium salts.
ChemInform Abstract: Photochemical Cleavage Reaction of 8‐Quinolinyl Sulfonates that Are Halogenated and Nitrated at the 7‐Position.
Authors: Ariyasu Shinya , Hanaya Kengo , Tsunoda Megumi , Kitamura Masanori , Hayase Masanori , Abe Ryo , Aoki Shin 
Published: March 2012

AbstractPhotochemical cleavage reactions of 8‐quinolinyl sulfonates bearing different substituents at 7‐position show that the photoreaction of 7‐bromo and 7‐iodo substituted compounds is accelerated due to the heavy‐atom effect.
ChemInform Abstract: Inexpensive Phthalic Acid Promoted Domino Povarov Reaction Between Anilines and N‐Vinylamides: An Efficient Preparation of Privileged 4‐Substituted 2‐Methyl‐1,2,3,4‐tetrahydroquinoline Scaffolds.
Authors: Kouznetsov Vladimir , Merchan Arenas Diego R. , Ortiz Areniz Cesar J. , Melendez Gomez Carlos M. 
Published: March 2012

AbstractA novel convenient protocol for the synthesis of tetrahydroquinolines is reported.
ChemInform Abstract: PdCl2(dppf)‐Catalyzed in situ Coupling of 2‐Hydroxypyridines with Aryl Boronic Acids Mediated by PyBroP and the One‐Pot Chemo‐ and Regioselective Construction of Two Distinct Aryl—Aryl Bonds.
Authors: Li Shui‐Ming , Huang Jie , Chen Guo‐Jun , Han Fu‐She 
Published: March 2012

AbstractThe Suzuki—Miyaura coupling of 2‐hydroxypyridines (I) and 2‐hydroxyquinolines (IV) with corresponding boronic acids gives rise to a variety of 2‐arylated derivatives (III) and (V).
ChemInform Abstract: Cerium(IV) Ammonium Nitrate Catalyzed Green Synthesis of 2‐Substituted 2,3‐Dihydroquinazolin‐4(1H)‐ones Using a Grinding Technique.
Authors: Wang M. , Gao J. J. , Song Z. G. , Wang L. 
Published: March 2012

AbstractThe reaction is simply carried out by initial grinding for about 10 min followed by heating the ground mixture.
ChemInform Abstract: Microwave‐Assisted Synthesis of Tetrahydropyrimidines via Multicomponent Reactions and Evaluation of Biological Activities.
Authors: Akbas Esvet , Berber Ismet , Akyazi Inci , Anil Baris , Yildiz Ela 
Published: March 2012

AbstractThe compounds (IV) and (VI) are screened in vitro for their biological activity against four Gram‐positive and one Gram‐negative bacteria, and against three yeast strains.
ChemInform Abstract: Utility of Methyl 2‐Isothiocyanatobenzoate in the Synthesis of Some New Quinazoline Derivatives as Potential Anticancer and Radiosensitizing Agents.
Authors: Ghorab Mostafa M. , Ragab Fatma A. , Heiba Helmi I. , Bayomi Ahmad A. 
Published: March 2012

AbstractNovel quinazoline derivatives bearing the pharmacologically interesting sulfonamide moiety are synthesized and evaluated for their in vitro anticancer activity against the HEPG2 cell line.
ChemInform Abstract: Preparation, Spectral Properties, and Electron Affinity of Bis(thiadiazolo)quinoxaline and Bis(thiadiazolo)phenanthroquinoxaline as n‐Type Semiconductors.
Authors: Ishi‐i Tsutomu , Nakanishi Taro , Teshima Yuuki , Yasuda Takeshi , Han Liyuan 
Published: March 2012

AbstractThe spectroscopic and electrochemical properties of the title compounds (III) and (V) are investigated in CH2Cl2.
ChemInform Abstract: A Convenient Synthesis of Novel 2,8‐Disubstituted Pyrido[3,4‐b]pyrazines Possessing Biological Activity.
Authors: Antoine Maud , Gerlach Matthias , Guenther Eckhard , Schuster Tilmann , Czech Michael , Seipelt Irene , Marchand Pascal 
Published: March 2012

AbstractCondensation of suitable diaminopyridines [cf.
ChemInform Abstract: Synthesis and Structure of 7H‐12‐Oxa‐3,7‐diazapleiadenes.
Authors: Tkachev V. V. , Shilov G. V. , Aldoshin S. M. , Sayapin Yu. A. , Bang Duong Nghia , Komissarov V. N. , Minkin V. I. 
Published: March 2012

AbstractThe structure of previously synthesized diazapleiadenes and their acylated derivatives (III) is proved by X‐ray analyses.
ChemInform Abstract: An Efficient and Convenient Bromination of BODIPY Derivatives with Copper(II) Bromide.
Authors: Ye Jia‐Hai , Wang Guangpu , Huang Chengmei , Hu Zhengjuan , Zhang Whenchao , Zhang Yan 
Published: March 2012

AbstractThe mono‐ and dibromination of so‐called BODIPYs (I) CuBr2 is investigated.
ChemInform Abstract: Selenacalix[3]triazines: Synthesis and Host—Guest Chemistry.
Authors: Thomas Joice , Van Rossom Wim , Van Hecke Kristof , Van Meervelt Luc , Smet Mario , Maes Wouter , Dehaen Wim 
Published: March 2012

AbstractThe trimeric macrocycles (II), obtained via nucleophilic aromatic substitution of halogenated triazines in a convenient one‐pot procedure, can easily be purified by simple precipitation.
ChemInform Abstract: Palladium‐Catalyzed Intramolecular Decarboxylative Allylation of (2‐Trimethylstannyl)allyl β‐Oxocarboxylates.
Authors: Piers Edward , Romero Miguel Angel 
Published: March 2012

AbstractA three‐step sequence for the synthesis ketones (VI) and (X) is based on Pd‐catalyzed intramolecular decarboxylative allylation.
ChemInform Abstract: Androgen Receptor Antagonists and Antiprostate Cancer Activities of Some Synthesized Steroidal Candidates.
Authors: Bahashwan Saleh Abd El‐Rahman , Al‐Omar Mohamed Abd El‐Rahman , Ezzeldin Essam , Abdalla Mohamed Mostafa , Fayed Ahmed Abd El‐Hameed , Amr Abdel‐Galil El‐Sayed 
Published: March 2012

AbstractNovel steroid derivatives (III)‐(V) are synthesized and their androgen receptor antagonist activities and in vivo antiandrogenic properties are evaluated.
ChemInform Abstract: Chemistry of Renieramycins. Part 10. Structure of Renieramycin V, a Novel Renieramycin Marine Natural Product Having a Sterol Ether at C‐14 Position.
Authors: Saito Naoki , Yoshino Miho , Charupant Kornvika , Suwanborirux Khanit 
Published: March 2012

AbstractRenieramycin V (I) is isolated from the low polar fraction obtained from the Thai blue sponge Xestospongia sp.
ChemInform Abstract: Abenquines A—D: Aminoquinone Derivatives Produced by Streptomyces sp. Strain DB634.
Authors: Schulz Dirk , Beese Pascal , Ohlendorf Birgit , Erhard Arlette , Zinecker Heidi , Dorador Cristina , Imhoff Johannes 
Published: March 2012

AbstractAbenquines A, B1, B2, C and D (Ia)—(Ie), resp., show inhibitory activity against bacteria, dermatophytic fungi and phosphodiesterase type 4b.
ChemInform Abstract: Chemical Constituents of Agarwood Originating from the Endemic Genus Aquilaria Plants
Authors: Chen Huai‐Qiong , Wei Jian‐He , Yang Jun‐Shan , Zhang Zheng , Yang Yun , Gao Zhi‐Hui , Sui Chun , Gong Bao 
Published: March 2012

AbstractReview: 65 refs.
Supercritical Fluid Deposition of Uniform PbS Nanoparticle Films for Energy‐Transfer Studies
Authors: Wang Joanna S. , Brown Gail J. , Hung Wei‐Chun , Wai Chien M. 
Published: March 2012

AbstractUsing supercritical fluid CO2 (Sc‐CO2) as a medium, PbS nanoparticles can be uniformly deposited on surfaces of various substrates. Sc‐CO2 deposition of PbS nanoparticles on carbon‐coated copper grids, into small holes in silicon, and formation of uniform PbS nanoparticle films on glass are described. Fluorescence spectra of PbS nanoparticles obtained from the films prepared by the Sc‐CO2 method indicate effective energy transfer between PbS nanoparticles of different sizes.
Recent Advances in Research Applications of Nanophase Hydroxyapatite
Authors: Fox Kate , Tran Phong A. , Tran Nhiem 
Published: March 2012

AbstractHydroxyapatite, the main inorganic material in natural bone, has been used widely for orthopaedic applications. Due to size effects and surface phenomena at the nanoscale, nanophase hydroxyapatite possesses unique properties compared to its bulk‐phase counterpart. The high surface‐to‐volume ratio, reactivities, and biomimetic morphologies make nano‐hydroxyapatite more favourable in applications such as orthopaedic implant coating or bone substitute filler. Recently, more efforts have been focused on the possibility of combining hydroxyapatite with other drugs and materials for multipurpose applications, such as antimicrobial treatments, osteoporosis treatments and magnetic manipulation. To build more effective nano‐hydroxyapatite and composite systems, the particle synthesis processes, chemistry, and toxicity have to be thoroughly investigated. In this Minireview, we report the recent advances in research regarding nano‐hydroxyapatite. Synthesis routes and a wide range of applications of hydroxyapatite nanoparticles will be discussed. The Minireview also addresses several challenges concerning the biosafety of the nanoparticles.
Nickel‐Promoted Tungsten Carbide Catalysts for Cellulose Conversion: Effect of Preparation Methods
Authors: Ji Na , Zheng Mingyuan , Wang Aiqin , Zhang Tao , Chen Jingguang G. 
Published: March 2012

AbstractA series of Ni‐promoted W2C catalysts was prepared by means of a post‐impregnation method and evaluated for the catalytic conversion of cellulose into ethylene glycol (EG). Quite different from our previously reported Ni–W2C/AC catalysts, which were prepared by using the co‐impregnation method, the introduction of Ni by the post‐impregnation method did not cause catalyst sintering, but resulted in redispersion of the W component, which was identified and characterized by means of XRD, TEM, and CO chemisorption. The highly dispersed Ni‐promoted W2C catalyst was very active and selective in cellulose conversion into EG, with a 100 % conversion of cellulose and a 73.0 % yield in EG. The underlying reason for the enhanced catalytic performance was most probably the significantly higher dispersion of active sites on the catalyst.
Application of Y2O3:Er3+ Nanorods in Dye‐Sensitized Solar Cells
Authors: Wang Jiangli , Wu Jihuai , Lin Jianming , Huang Miaoliang , Huang Yunfang , Lan Zhang , Xiao Yaoming , Yue Gentian , Yin Shu , Sato Tsugio 
Published: March 2012

AbstractY2O3:Er3+ nanorods are synthesized by means of a hydrothermal method and then introduced into a TiO2 electrode in a dye‐sensitized solar cell (DSSC). Y2O3:Er3+ improves infrared light harvest via up‐conversion luminescence and increases the photocurrent of the DSSC. The rare earth ions improve the energy level of the TiO2 electrode through a doping effect and thus increase the photovoltage. The light scattering is ameliorated by the one‐dimensional nanorod structure. The DSSC containing Y2O3:Er3+ (5 wt %) in the doping layer achieves a light‐to‐electric energy conversion efficiency of 7.0 %, which is an increase of 19.9 % compared to the DSSC lacking of Y2O3:Er3+.
Simulation of absorption‐based surface plasmon resonance sensor in the Kretschmann configuration
Authors: Fekete Ádám 
Published: March 2012

SUMMARYSurface plasmon resonance (SPR) has been efficiently applied for chemical and biosensing. In this paper, we present a new numerical simulation for the Kretschman type SPR sensors. In order to apply a circuit approach, we decomposed the problem by (1) using GAMESS to determine the dielectric function of the molecular layer, (2) using Computer Simulation Technology Microwave Studio to calculate the electromagnetic field. An interactive computer‐aided design technique is presented for Kretschmann‐type biosensors. Copyright © 2012 John Wiley & Sons, Ltd.
Small population size and extremely low levels of genetic diversity in island populations of the platypus, Ornithorhynchus anatinus
Authors: Furlan Elise , Stoklosa J. , Griffiths J. , Gust N. , Ellis R. , Huggins R. M. , Weeks A. R. 
Published: March 2012

AbstractGenetic diversity generally underpins population resilience and persistence. Reductions in population size and absence of gene flow can lead to reductions in genetic diversity, reproductive fitness, and a limited ability to adapt to environmental change increasing the risk of extinction. Island populations are typically small and isolated, and as a result, inbreeding and reduced genetic diversity elevate their extinction risk. Two island populations of the platypus, Ornithorhynchus anatinus, exist; a naturally occurring population on King Island in Bass Strait and a recently introduced population on Kangaroo Island off the coast of South Australia. Here we assessed the genetic diversity within these two island populations and contrasted these patterns with genetic diversity estimates in areas from which the populations are likely to have been founded. On Kangaroo Island, we also modeled live capture data to determine estimates of population size. Levels of genetic diversity in King Island platypuses are perilously low, with eight of 13 microsatellite loci fixed, likely reflecting their small population size and prolonged isolation. Estimates of heterozygosity detected by microsatellites (HE= 0.032) are among the lowest level of genetic diversity recorded by this method in a naturally outbreeding vertebrate population. In contrast, estimates of genetic diversity on Kangaroo Island are somewhat higher. However, estimates of small population size and the limited founders combined with genetic isolation are likely to lead to further losses of genetic diversity through time for the Kangaroo Island platypus population. Implications for the future of these and similarly isolated or genetically depauperate populations are discussed.
Aeolian process effects on vegetation communities in an arid grassland ecosystem
Authors: Alvarez Lorelei J. , Epstein Howard E. , Li Junran , Okin Gregory S. 
Published: March 2012

AbstractMany arid grassland communities are changing from grass dominance to shrub dominance, but the mechanisms involved in this conversion process are not completely understood. Aeolian processes likely contribute to this conversion from grassland to shrubland. The purpose of this research is to provide information regarding how vegetation changes occur in an arid grassland as a result of aeolian sediment transport. The experimental design included three treatment blocks, each with a 25 × 50 m area where all grasses, semi‐shrubs, and perennial forbs were hand removed, a 25 × 50 m control area with no manipulation of vegetation cover, and two 10 × 25 m plots immediately downwind of the grass‐removal and control areas in the prevailing wind direction, 19° north of east, for measuring vegetation cover. Aeolian sediment flux, soil nutrients, and soil seed bank were monitored on each treatment area and downwind plot. Grass and shrub cover were measured on each grass‐removal, control, and downwind plot along continuous line transects as well as on 5 × 10 m subplots within each downwind area over four years following grass removal. On grass‐removal areas, sediment flux increased significantly, soil nutrients and seed bank were depleted, and Prosopis glandulosa shrub cover increased compared to controls. Additionally, differential changes for grass and shrub cover were observed for plots downwind of vegetation‐removal and control areas. Grass cover on plots downwind of vegetation‐removal areas decreased over time (2004–2007) despite above average rainfall throughout the period of observation, while grass cover increased downwind of control areas; P. glandulosa cover increased on plots downwind of vegetation‐removal areas, while decreasing on plots downwind of control areas. The relationships between vegetation changes and aeolian sediment flux were significant and were best described by a logarithmic function, with decreases in grass cover and increases in shrub cover occurring with small increases in aeolian sediment flux.
Early stages of divergence: phylogeography, climate modeling, and morphological differentiation in the South American lizard Liolaemus petrophilus (Squamata: Liolaemidae)
Authors: Fontanella Frank M. , Feltrin Natalia , Avila Luciano J. , Sites Jack W. , Morando Mariana 
Published: March 2012

AbstractThis study examines the phylogeographic structure within the Patagonian lizard Liolaemus petrophilus and tests for patterns of between‐clade morphological divergence and sexual dimorphism, as well as demographic and niche changes associated with Pleistocene climate changes. We inferred intraspecific relationships, tested hypotheses for historical patterns of population expansion, and incorporated ecological niche modeling (ENM) with standard morphological and geometric morphometric analyses to examine between‐clade divergence as indirect evidence for adaptation to different niches. The two inferred haploclades diverged during the early Pleistocene with the Southern clade depicting the genetic signature of a recent population increase associated with expanding niche envelope, whereas the Northern clade shows stable populations in a shrinking niche envelope. The combination of molecular evidence for postisolation demographic change and ENM, suggest that the two haploclades have responded differently to Pleistocene climatic events.
Enrichment of frying oils with plant phenolic extracts to extend the usage life
Authors: Aydeniz Buket , Yilmaz Emin 
Published: March 2012

AbstractThe aim of this research was to evaluate the efficacy of extracts prepared from olive leaf (OLVL), hazelnut leaf (HAZL), and hazelnut green leafy cover (HGLC) in frying conditions. The extracts were added into canola oil at 200 ppm phenolic equivalence level and fried for seven consecutive days and analyzed. Generally, the lowest phenolic content and antioxidant capacity value were measured in HGLC extract, although, the best performance during frying was with HGLC extract. There were significant differences among the free acidity, conjugated dienoic acids, and total polar materials (TPM). The oil enriched with HGLC extract did not exceed the limit TPM value at the end of seventh day. Also the remaining antioxidant capacities in the frying oil samples were highest in HGLC enriched samples. The viscosity and turbidity values of the oils enriched with OLVL and HAZL extract were a little higher than a control sample. Generally trans‐fatty acid formation was lower in the enriched oil samples. Also significant decreases in the level of unsaturated fatty acids during frying period were observed. This study shows that enriching oils with easily found and cheap natural plant extracts can extend their usage life.Practical applications: The results of this study have shown that liquid frying oils can successfully be enriched with plant phenolic extract to enhance thermo‐oxidative stability. Addition of phenolic extract up to 200 ppm level have not created any problem in sensory quality of either the oil or fried dough. The HGLC and OLVL extract were found very suitable for this purpose. These materials are common agro‐food by‐products and can be produced very easily with low cost. Also, this type of enrichment may aid consumers to get some beneficial phenolic compounds through fried food consumption. In addition, these types of applications may open another area for marketing the named plant extracts.
The impact of individualistic and collectivistic orientation on the judgment of self‐presentation
Authors: Chen Fang Fang , Jing Yiming 
Published: March 2012

AbstractThe aims of this paper are two‐fold: (i) to examine the impact of audience individualism and collectivism orientation on the judgment of strategic self‐presentations and (ii) to test whether audience individualism and collectivism orientation would affect the importance of likeability and competence in determining social outcomes. In two studies, participants evaluated modest and boastful presentations in an achievement context. It was found that the more collectivistic the audience was, the more likely the modest presenter was to be rated as likable, competent, and deserving of a desirable social outcome. In contrast, the more individualistic the audience was, the more likely the boastful presenter was to be rated as likeable, competent, and deserving of a desirable social outcome. The importance of likeability and competence in predicting the final social outcome was moderated by audience individualism and collectivism orientation. Likeability was more important in deciding the social outcome for those who were more collectivistic than for those who were less so (Study 1). Competence was more important in determining the social outcome for those who were more individualistic (Study 2). These studies build a potential theoretical bridge between social influence and social perception/social judgment literature. Copyright © 2012 John Wiley & Sons, Ltd.