bluuebunny/crossref_metadata_2025_split huggingface dataset:
Homometallic Rare‐Earth Metal Phosphinidene Clusters: Synthesis and Reactivity
Authors: Wang Kai , Luo Gen , Hong Jianquan , Zhou Xigeng , Weng Linhong , Luo Yi , Zhang Lixin 
Published: December 2013

AbstractTwo new trinuclear μ3‐bridged rare‐earth metal phosphinidene complexes, [{L(Ln)(μ‐Me)}3(μ3‐Me)(μ3‐PPh)] (L=[PhC(NC6H4iPr2‐2,6)2]−, Ln=Y (2 a), Lu (2 b)), were synthesized through methane elimination of the corresponding carbene precursors with phenylphosphine. Heating a toluene solution of 2 at 120 °C leads to an unprecedented ortho CH bond activation of the PhP ligand to form the bridged phosphinidene/phenyl complexes. Reactions of 2 with ketones, thione, or isothiocyanate show clear phospha‐Wittig chemistry, giving the corresponding organic phosphinidenation products and oxide (sulfide) complexes. Reaction of 2 with CS2 leads to the formation of novel trinuclear rare‐earth metal thione dianion clusters, for which a possible pathway was determined by DFT calculation.
The Colloidal Stabilization of Carbon with Carbon: Carbon Nanobubbles as both Dispersant and Glue for Carbon Nanotubes
Authors: Kuzmicz Danuta , Prescher Simon , Polzer Frank , Soll Sebastian , Seitz Christoph , Antonietti Markus , Yuan Jiayin 
Published: December 2013

AbstractThe superior physical properties of carbon nanotubes (CNTs) have led to their broad application. Intrinsically, CNTs tend to agglomerate from hydrophobic interactions, which is highly undesirable for solution processing and device fabrication. Commonly, a stabilizer consisting of organic surfactants or polymers is used to disperse CNTs. Recently, we synthesized nitrogen‐doped carbon hollow nanospheres (25–90 nm), termed carbon “nanobubbles”. They bear superior dispersability in water and distinctive graphitic order. Herein, we describe the nanobubble‐assisted dispersion of CNTs in aqueous solution upon sonication. This process relies on the π–π interaction between the two aromatic carbon nanostructures, which can process their carbon mixture in water into conductive filter membranes, ink, and discs. This stabilization can be extended to other aromatic carbons. In addition, the π–π interaction may create a new type of carbon p–n junction that can be used to improve charge separation.
Cucurbit[7]uril: A High‐Affinity Host for Encapsulation of Amino Saccharides and Supramolecular Stabilization of Their α‐Anomers in Water
Authors: Jang Yoonjung , Natarajan Ramalingam , Ko Young Ho , Kim Kimoon 
Published: December 2013

AbstractCucurbit[7]uril (CB[7]), an uncharged and water‐soluble macrocyclic host, binds protonated amino saccharides (D‐glucosamine, D‐galactosamine, D‐mannosamine and 6‐amino‐6‐deoxy‐D‐glucose) with excellent affinity (Ka=103 to 104 M−1). The host–guest complexation was confirmed by NMR spectroscopy, isothermal titration calorimetry (ITC), and MALDI‐TOF mass spectral analyses. NMR analyses revealed that the amino saccharides, except D‐mannosamine, are bound as α‐anomers within the CB[7] cavity. ITC analyses reveal that CB[7] has excellent affinity for binding amino saccharides in water. The maximum affinity was observed for D‐galactosamine hydrochloride (Ka=1.6×104 M−1). Such a strong affinity for any saccharide in water using a synthetic receptor is unprecedented, as is the supramolecular stabilization of an α‐anomer by the host.
Infrared Spectra of Protonated Coronene and Its Neutral Counterpart in Solid Parahydrogen: Implications for Unidentified Interstellar Infrared Emission Bands
Authors: Bahou Mohammed , Wu Yu‐Jong , Lee Yuan‐Pern 
Published: December 2013

AbstractLarge protonated polycyclic aromatic hydrocarbons (H+PAHs) are possible carriers of unidentified infrared (UIR) emission bands from interstellar objects, but the characterization of infrared (IR) spectra of large H+PAHs in the laboratory is challenging. IR absorption spectra of protonated coronene (1‐C24H13+) and mono‐hydrogenated coronene (1‐C24H13.), which were produced upon electron bombardment of parahydrogen containing a small proportion of coronene (C24H12) during matrix deposition, were recorded. The spectra are of a much higher resolution than those obtained by IR multiphoton dissociation by Dopfer and co‐workers. The IR spectra of protonated pyrene and coronene collectively appear to have the required chromophores for features of the UIR bands, and the spectral shifts on an increase in the number of benzenoid rings point in the correct direction towards the positions of the UIR bands. Larger protonated peri‐condensed PAHs might thus be key species among the carriers of UIR bands.
Reversible and Irreversible Chemisorption in Nonporous‐Crystalline Hybrids
Authors: Solis‐Ibarra Diego , Karunadasa Hemamala I. 
Published: December 2013

AbstractThe tools of synthetic chemistry allow us to fine‐tune the reactivity of molecules at a level of precision not yet accessible with inorganic solids. We have investigated hybrids that couple molecules to the superior thermal and mechanical properties of solids. Herein we present, to the best of our knowledge, the first demonstration of reactivity between hybrid perovskites and substrates. Reaction with iodine vapor results in a remarkable expansion of these materials (up to 36 % in volume) where new covalent CI bonds are formed with retention of crystallinity. These hybrids also show unusual examples of reversible chemisorption. Here, solid‐state interactions extend the lifetime of molecules that cannot be isolated in solution. We have tuned the half‐lives of the iodinated structures from 3 h to 3 days. These nonporous hybrids drive substrate capture and controlled release through chemical reactivity. We illustrate the strengths of the hybrid by considering radioactive iodine capture.
Lactose as a “Trojan Horse” for Quantum Dot Cell Transport
Authors: Benito‐Alifonso David , Tremel Shirley , Hou Bo , Lockyear Harriet , Mantell Judith , Fermin David J. , Verkade Paul , Berry Monica , Galan M. Carmen 
Published: December 2013

AbstractA series of glycan‐coated quantum dots were prepared to probe the effect of glycan presentation in intracellular localization in HeLa and SV40 epithelial cells. We show that glycan density mostly impacts on cell toxicity, whereas glycan type affects the cell uptake and intracellular localization. Moreover, we show that lactose can act as a “Trojan horse” on bi‐functionalized QDs to help intracellular delivery of other non‐internalizable glycan moieties and largely avoid the endosomal/lysosomal degradative pathway.
Cellulose fibers from cellulose/1‐ethyl‐3‐methylimidazolium acetate solution by wet spinning with increasing spinning speeds
Authors: Li Xiaojun , Li Nianke , Xu Jigang , Duan Xianquan , Sun Yushan , Zhao Qiang 
Published: December 2013

ABSTRACTCellulose fibers from cellulose/1‐ethyl‐3‐methylimidazolium acetate solution were prepared by wet spinning with increasing extrusion speeds and draw ratios. The effects of spinning speeds on the structures and mechanical properties of these fibers were investigated by using scanning electron microscopy, wide angle X‐ray diffraction, birefringence, thermogravimetric analysis, tensile‐fineness tester, and wet friction. The results showed that the crystallinity, orientation, and mechanical properties of the fibers were improved with increasing draw ratio. The break draw ratios, degrees of crystallinity and orientation, tenacities, and wet friction time of the cellulose fibers decreased with increasing extruding speeds. The wet friction time decreased with increasing draw ratio and decreased faster under higher extrusion speed. Due to the high dope concentration and the increased draw ratio, the maximum tenacity of the regenerated cellulose fibers reached 2.73 cN/dtex. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40225.
Patient with disorganization syndrome: Surgical procedures, Pathology, and potential causes
Authors: Vallejo Oscar Girón , Benítez Sánchez María del Carmen , Cánovas Cesar Salcedo , Ontiveros Joanna Díez , Ruiz Jiménez José Ignacio , Bermejo‐Sánchez Eva , Martínez‐Frías María Luisa 
Published: December 2013

BACKGROUNDThe human disorganization syndrome (HDS) is an extremely rare malformation syndrome that presents with a severe pattern of defects affecting different structures.METHODSWe describe a newborn girl presenting with HDS. Her clinical features included a large appendage arising from the right buttock as the only alteration, with size and shape of a lower member‐like structure, and a pedicle of the extra limb structure. The surgical observations, the pathological results, evolution up to 6 months of age, and their potential causes are described, as well as a review of the literature.RESULTSThe MRI procedure also detected a multicystic mass located at the presacral region of the pelvis and perineum, without any dysraphism or other medullary anomalies. The X‐ray showed that the member‐like structure had an iliac wing, femur, tibia, fibula, and aberrant metatarsals. The review of the literature shows disparate defects of the published cases with HDS, which include some features pathogenically not related with this syndrome.CONCLUSIONWe highlight the need to maintain restricted the clinical diagnosis for HDS to those concordant with a great disorganization of morphogenetic inductions affecting the three germ layers, which occur during the first four weeks of development. This is crucial to: (a) perform a correct diagnosis, which is essential to establish the prognosis and surgery procedures, (b) identify which is/are the cause/s, and (c) the adequate genetic counseling. Birth Defects Research (Part A), 97:781–785, 2013. © 2013 Wiley Periodicals, Inc.
Second study on the recurrence risk of isolated esophageal atresia with or without trachea‐esophageal fistula among first‐degree relatives: No evidence for increased risk of recurrence of EA/TEF or for malformations of the VATER/VACTERL association spectrum
Authors: Choinitzki Vera , Zwink Nadine , Bartels Enrika , Baudisch Friederike , Boemers Thomas M. , Hölscher Alice , Turial Salmai , Bachour Haitham , Heydweiller Andreas , Kurz Ralf , Bartmann Peter , Pauly Markus , Brokmeier Ulrike , Leutner Andreas , Nöthen Markus M. , Schumacher Johannes , Jenetzky Ekkehart , Reutter Heiko 
Published: December 2013

BACKGROUNDEsophageal atresia with/without trachea‐esophageal fistula (EA/TEF) denotes a spectrum of severe congenital malformations. The aim of this systematic study was to determine both the recurrence risk for EA/TEF, and the risk for malformations of the VATER/VACTERL association spectrum, in first‐degree relatives of patients with isolated EA/TEF.METHODSA total of 108 unrelated patients with isolated EA/TEF were included. These individuals had 410 first‐degree relatives including 194 siblings. The presence of EA/TEF and malformations of the VATER/VACTERL association spectrum in relatives was systematically assessed. Data from the EUROCAT network were used for comparison.RESULTSNone of the first‐degree relatives displayed any form of EA/TEF. In two families, a first‐degree relative presented with malformations from the VATER/VACTERL association spectrum. However, no increase in the risk for malformations of the VATER/VACTERL association spectrum was found compared with the control cohort (p = 0.87). In three families, one more distantly related relative presented with EA/TEF.CONCLUSIONIn contrast to previous studies, our results suggest a very low recurrence risk for isolated EA/TEF and/or for malformations of the VATER/VACTERL association spectrum among first‐degree relatives. Birth Defects Research (Part A), 97:786–791, 2013. © 2013 Wiley Periodicals, Inc.
The Economic Relevance of Environmental Disclosure and its Impact on Corporate Legitimacy: An Empirical Investigation
Authors: Cormier Denis , Magnan Michel 
Published: December 2013

AbstractIn determining its environmental disclosure strategy, a firm's management faces a tension between responding to the information needs of financial markets and maintaining its legitimacy within the community. In this paper, relying on information economics and legitimacy theory, we explore how firms resolve this tension. Results show that a firm's environmental disclosure enhances the quality of analysts' information context, which ultimately allows them to make better forecasts. Moreover, financial analysts seem to be able to decipher environmental information, discounting discourses that are inconsistent with a firm's underlying environmental performance. We find also that a firm's environmental disclosure serves another purpose, as it influences how its other stakeholders (beyond financial ones) perceive its legitimacy. Such enhanced legitimacy reduces the information uncertainty faced by financial analysts. Our results suggest also that both economic‐based environmental disclosure and sustainable development and environmental disclosure are useful to analysts in making their forecasts and enhance a firm's legitimacy. Copyright © 2013 John Wiley & Sons, Ltd and ERP Environment.
Development of a CFD Model of Bubble Column Bioreactors: Part Two – Comparison of Experimental Data and CFD Predictions
Authors: McClure Dale D. , Kavanagh John M. , Fletcher David F. , Barton Geoffrey W. 
Published: December 2013

AbstractThe application of computational fluid dynamics (CFD) as a tool to simulate bubble column bioreactors is investigated. A three‐dimensional model utilizing the Euler‐Euler approach is evaluated. The role of various terms, i.e., lift, drag, bubble‐induced turbulence, and volume fraction correction terms for drag, is determined. Good agreement between experimental data and simulation results was obtained by means of a single‐bubble size model provided that bubble‐induced turbulence and the reduction in drag due to the presence of other bubbles were taken into account.
Heathcock‐Inspired Strategies for the Synthesis of Fawcettimine‐Type Lycopodium Alkaloids
Authors: Murphy Rebecca A. , Sarpong Richmond 
Published: December 2013

AbstractThe fawcettimine‐type Lycopodium alkaloids have garnered significant attention from synthetic organic chemists since the isolation of fawcettimine in 1959. Despite being targets of interest for over 50 years, most of the strategies employed in the syntheses of fawcettimine congeners have built upon Inubushi and Heathcock’s original work, realized in 1979 and 1986, respectively. This elegant strategy has been explored and expanded upon in the intervening years since the original publications, in what we now call the Heathcock‐inspired strategy. While other disconnections have been disclosed, this strategy remains one of the most efficient. In this Concept article, we focus on exploring a number of recent Heathcock‐inspired syntheses of fawcettimine‐type Lycopodium alkaloids. We also briefly discuss alternative, novel disconnections.
Hydrogen‐Bonding in Aminocatalysis: From Proline and Beyond
Authors: Albrecht Łukasz , Jiang Hao , Jørgensen Karl Anker 
Published: December 2013

AbstractThis Concept article summarizes recent progress in the field of hydrogen‐bonding aminocatalysis using proline‐derived systems. The aminocatalysts available in the literature are categorized by the incorporated hydrogen‐bonding scaffold and its mode of recognition. Both mono‐ and double‐hydrogen‐bonding motifs are discussed and examples of their application in asymmetric synthesis are given.
ChemInform Abstract: Bubble Template Synthesis of Sn2Nb2O7 Hollow Spheres for Enhanced Visible‐Light‐Driven Photocatalytic Hydrogen Production.
Authors: Zhou Chao , Zhao Yufei , Bian Tong , Shang Lu , Yu Huijun , Wu Li‐Zhu , Tung Chen‐Ho , Zhang Tierui 
Published: December 2013

AbstractThe title hollow spheres are hydrothermally synthesized from mixtures of Nb2O5, SnCl2, urea, and KOH solution, using NH3 and CO2 bubbles produced by decomposition of urea as soft templates (autoclave, 200 °C, 12 h).
ChemInform Abstract: Preparation, Ionic Conductivity and Thermochemistry of New Bi12.5Lu1.5ReO24.5 Phase.
Authors: Matskevich N. I. , Wolf Th. , Greaves C. , Bryzgalova A. N. 
Published: December 2013

AbstractThe new title compound is synthesized from a mixture of Bi2O3, Re2O7, and Lu2O3 in air (1070 K, 70 h) and characterized by powder X‐ray and neutron diffraction, conductivity measurements, and solution calorimetry.
ChemInform Abstract: Stereoselective Lewis Base‐Catalyzed Asymmetric Hydrosilylation of α‐Acetamido‐β‐enamino Esters: Straightforward Approach for the Construction of α,β‐Diamino Acid Derivatives.
Authors: Jiang Yan , Chen Xing , Hu Xiao‐Yan , Shu Chang , Zhang Yong‐Hong , Zheng Yong‐Sheng , Lian Chun‐Xia , Yuan Wei‐Cheng , Zhang Xiao‐Mei 
Published: December 2013

AbstractA novel L‐serine derived catalyst is investigated for the stereoselective hydrosilylation of α‐acetamido‐β‐enamino esters.
ChemInform Abstract: Copper‐Catalyzed Nucleophilic Trifluoromethylation of Propargylic Halides.
Authors: Miyake Yoshihiro , Ota Shin‐ichi , Shibata Masashi , Nakajima Kazunari , Nishibayashi Yoshiaki 
Published: December 2013

AbstractCu‐catalyzed trifluoromethylation of primary propargylic alcohols (I) affords the corresponding trifluoromethylated products (III), while the reaction with secondary propargylic chlorides (IV) gives rise to the formation of trifluoromethylated allenes (V).
ChemInform Abstract: Transalkylation of N‐Methyl Tertiary Amines with 3,4‐Dibromobutenolides.
Authors: Wei Meng‐Xue , Gao Xiao‐Hui , Li Tian‐Cai , Fan Chun‐An , Li Xue‐Qiang 
Published: December 2013

AbstractEnamine (Va) shows promising anticancer activity against HeLa cell lines.
ChemInform Abstract: Triarylaminium Salt‐Initiated Aerobic Double Friedel—Crafts Reaction of Glycine Derivatives with Indoles.
Authors: Hou Congde , Wang Cheng , Sun Chougu , Jia Xiaodong , Wang Xicun , Chang Wenju , Wu Mingxia 
Published: December 2013

AbstractAn aminium radical catalyzed reaction of N‐tosylglycine derivatives with indoles is developed to yield products (III), (VI), and (VIII) via a double Friedel—Crafts reaction.
ChemInform Abstract: Microwave‐Assisted Synthesis of 3‐Substituted Indoles via Intramolecular Arene—Alkene Coupling of o‐Iodoanilino Enamines.
Authors: Lee Won‐Il , Jung Jong‐Wha , Sim Jaehoon , An Hongchan , Suh Young‐Ger 
Published: December 2013

AbstractA generally applicable and high‐yielding protocol for the synthesis of 3‐substituted indole derivatives is described.
ChemInform Abstract: A Three‐Component Reaction Between 1‐Substituted‐2‐methylimidazoles, Cyanophenylacetylene, and Various Aldehydes: Stereoselective Synthesis of (Z)‐(2‐Cyano‐1‐phenyl)vinyl Ethers of 2‐(2‐Hydroxyalkyl)imidazoles.
Authors: Trofimov Boris A. , Andriyankova Ludmila V. , Nikitina Lina P. , Belyaeva Kseniya V. , Mal'kina Anastasiya G. , Afonin Andrei V. , Ushakov Igor' A. 
Published: December 2013

AbstractA novel functionalization of imidazoles (I) at the C2‐methyl is achieved through a three‐component reaction with aliphatic and aromatic aldehydes and cyanophenylacetylene without a catalyst.
ChemInform Abstract: Introduction of Bulky tert‐Butyl Substituents on the Core of N,N′‐Diaryl N‐Heterocyclic Carbenes Through the Corresponding Vicinal Diamines.
Authors: Jacquemard Ulrich , Harpainter Phoebe , Roland Sylvain 
Published: December 2013

AbstractThe synthesis of NHC‐silver complexes possessing bulky tert‐butyl groups is developed.
ChemInform Abstract: Synthesis of (2‐Alkylthiothiazolin‐5‐yl)methyl Dodecanoates via Tandem Radical Reaction.
Authors: Kakaei Saeed , Xu Jiaxi 
Published: December 2013

AbstractA series of title compounds (III) is synthesized from N‐allylcarbamodithioates (I) and dilauroyl peroxide (II) via a tandem radical reaction involving a 5‐exo‐trig radical cyclization as key step.
ChemInform Abstract: Novel Nitrogen to Carbon Rearrangement Forming Nicotinic Acid Sulfonamides.
Authors: Rushingwa Evelyne , Touray Hadijatou K. , Bowen Richard D. , Gallagher Richard T. , Martin William H. C. 
Published: December 2013

AbstractTreatment of easily synthesized N‐acyl‐N‐benzyl‐2‐pyridinesulfonamides with LDA results in an efficient rearrangement to the 3‐acylated title compounds (IV).
ChemInform Abstract: Microwave‐Assisted Iridium‐Catalyzed Synthesis of Nicotine and Anabasine Derivatives.
Authors: Apsunde Tushar Dattu , Trudell Mark L. 
Published: December 2013

AbstractFunctionalized nicotine and anabasine analogues (III), (V), and (VII) are synthesized via microwave‐assisted heterocyclization of 1,4‐ and 1,5‐diols, respectively.
ChemInform Abstract: Direct C‐2 Alkylation of Quinoline N‐Oxides with Ethers via Palladium‐Catalyzed Dehydrogenative Cross‐Coupling Reaction.
Authors: Wu Zhiyong , Pi Chao , Cui Xiuling , Bai Jie , Wu Yangjie 
Published: December 2013

AbstractThe optimized protocol renders possible the dehydrogenative cross coupling reaction of ethers and quinoline N‐oxides under base‐free and mild conditions.
ChemInform Abstract: Synthesis of Some New Dihydropyrimidines by Iodine as a Catalyst at Ambient Temperature and Evaluation of Their Biological Activity.
Authors: Zalavadiya P. D. , Ghetiya R. M. , Dodiya B. L. , Vekariya P. B. , Joshi H. S. 
Published: December 2013

AbstractThe formation of dihydropyrimidines (IV) and (VII) from dicarbonyl compounds, aromatic aldehydes, and thiourea derivatives occurs with significant enhancement with regard to reaction rates, reaction time, and yield by using molecular iodine as the catalyst.
ChemInform Abstract: Synthesis, Biological Evaluation and Molecular Docking Studies of Some Pyrimidine Derivatives.
Authors: Fargualy Ahmed M. , Habib Nargues S. , Ismail Khadiga A. , Hassan Ahmed M. M. , Sarg Marwa T. M. 
Published: December 2013

AbstractThe compounds (IIIc) and (IIId) show antimicrobial activity against a broad spectrum of bacteria (S.
ChemInform Abstract: First Synthesis and Biological Evaluation of 4‐Amino‐2‐aryl‐6,9‐dichlorobenzo[g]pteridines as Inhibitors of TNF‐α and IL‐6.
Authors: Guirado Antonio , Lopez Sanchez Jose I. , Ruiz‐Alcaraz Antonio J. , Garcia‐Penarrubia Pilar , Bautista Delia , Galvez Jesus 
Published: December 2013

AbstractA method for the direct synthesis of the title compounds is described.
ChemInform Abstract: Nickel‐Catalyzed Manipulation of Tertiary Phosphines via Highly Selective C—P Bond Cleavage.
Authors: Cao Jian , Huang Xian , Wu Luling 
Published: December 2013

AbstractThe ring‐opening reaction of cyclopropa[b]naphthalenes with tertiary phosphines leads to a variety of novel bulky phosphines, e.g. compounds (VI) and (VIII).
Effects of the ambient temperature on the airflow across a Caucasian nasal cavity
Authors: Burgos M.A. , Sanmiguel‐Rojas E. , Martín‐Alcántara A. , Hidalgo‐Martínez M. 
Published: December 2013

SUMMARYWe analyse the effects of the air ambient temperature on the airflow across a Caucasian nasal cavity under different ambient temperatures using CFD simulations. A three‐dimensional nasal model was constructed from high‐resolution computed tomography images for a nasal cavity from a Caucasian male adult. An exhaustive parametric study was performed to analyse the laminar‐compressible flow driven by two different pressure drops between the nostrils and the nasopharynx, which induced calm breathing flow rates ࣈ 5.7 L/min and ࣈ 11.3 L/min. The inlet air temperature covered the range − 10oC ⩽ To ⩽50oC. We observed that, keeping constant the wall temperature of the nasal cavity at 37oC, the ambient temperature affects mainly the airflow velocity into the valve region. Surprisingly, we found an excellent linear relationship between the ambient temperature and the air average temperature reached at different cross sections, independently of the pressure drop applied. Finally, we have also observed that the spatial evolution of the mean temperature data along the nasal cavity can be collapsed for all ambient temperatures analysed with the introduction of suitable dimensionless variables, and this evolution can be modelled with the help of hyperbolic functions, which are based on the heat exchanger theory. Copyright © 2013 John Wiley & Sons, Ltd.