bluuebunny/crossref_metadata_2025_split huggingface dataset:
Competitive Hydrogenation of Alkyl‐Substituted Arenes by Transition‐Metal Nanoparticles: Correlation with the Alkyl‐Steric Effect
Authors: Fonseca Gledison S. , Silveira Edson T. , Gelesky Marcos A. , Dupont Jairton 
Published: May 2005

AbstractThe influence of substituents on rate constants of the hydrogenation of monoalkylbenzenes by transition metal nanoparticles or by classical heterogeneous catalysts can be rationalized in terms of the Taft rule. A series of the initial reaction rate constants obtained from various competitive toluene/benzene and toluene/monoalkylbenzene hydrogenation experiments catalyzed by transition‐metal nanoparticles prepared in the presence of imidazolium ionic liquids or surfactants [Ir(0), Rh(0) and Ru(0)] or by classical heterogeneous catalysts (PtO2, Rh/C, Rh/Al2O3, Ru/C, Ru/Al2O3 and Pd/C) have been correlated with the Taft equation $\left( {\log {{k_B k_B } \over {k_A k_a }} = \rho E_s } \right)$. Satisfactory correlation coefficients (r) (between 0.96 and 0.99) and positive slopes (ρ) between 0.38 and 0.83 have been obtained. The results clearly show that the reaction constants for the alkyl‐substituents can be expressed by steric factors and are independent of any other non‐steric factors. It is suggested that bulky alkylbenzene substituents, for both transition metal nanoparticles and classical heterogeneous hydrogenation reactions, lower the overall hydrogenation rate, implying a more disturbed transition state compared to the initial state of the hydrogenation (in terms of the Horiuti–Polanyi mechanism). This competitive method is suitable for the estimation of the constant selectivity for couples of alkylbenzenes in which the difference in hydrogenation rates are very high and experimentally difficult to measure and also useful for the design of more selective “nano” and classical catalysts for hydrogenation reactions.
Homologation of Monoterpenoids into New Sesquiterpenoids via Tandem Isomerisation/Claisen Rearrangement Reactions with Three‐Component Ruthenium Catalysts, and Ru(methallyl)2(COD) Revealed by High Throughput Screening Techniques
Authors: Le Nôtre Jérôme , Touzani Rachid , Lavastre Olivier , Bruneau Christian , Dixneuf Pierre H. 
Published: May 2005

AbstractA catalytic system B based on a ruthenium source Ru3(CO)12, a bulky imidazolinium salt and Cs2CO3 appears very efficient for the transformation of a 1,7‐diene into a γ,δ‐unsaturated aldehyde via tandem isomerisation/Claisen reactions. 1,6‐Dienes arising from the terpenoids menthone and myrtenal were selectively transformed into the corresponding unsaturated aldehydes with catalyst B. High throughput experiments were undertaken to evaluate other multicomponent catalysts: metal source/ligand/base for these tandem reactions. An unexpected catalyst was found to be Ru(methallyl)2(COD) which can operate without additional ligand or reagent.
Stretching operational life of trickle‐bed filters by liquid‐induced pulse flow
Authors: Iliuta Ion , Larachi Faïçal 
Published: May 2005

AbstractWhen dilute liquid suspensions contaminated with fine solids are treated in catalytic trickle‐bed reactors, bed plugging develops and increases the resistance to two‐phase flow until ultimate unit shutdown for bed substitution with pristine catalyst. The release of deposited fines, or the inhibition of fines deposition over some regions of the collector, is expected to alleviate the plugging if liquid flow shock or periodic operation policies are implemented. Current physical models linking gas–liquid phase flow to space–time evolution of fines deposition and release are unable to depict this new type of filtration in trickle beds. This work attempts to fill in this gap by developing a dynamic multiphase flow deep‐bed filtration model. The model incorporates the physical effects of porosity and effective specific surface area changes as a result of fines deposition/release, gas and suspension inertial effects, and coupling effects between the filtration parameters and the interfacial momentum exchange force terms. The release of the fine particles from the collector surface was assumed to be induced by the colloidal forces in the case of Brownian particles or by the hydrodynamic forces in the case of non‐Brownian particles. An important finding of the work was that for noncolloidal fines both induced pulsing and liquid flow shock operations conferred substantial improvements (measured in terms of reduction in specific deposit and pressure drop) in the mitigation of plugging in trickle‐bed reactors. However, because of the highest critical shear stress for fines in the colloidal range, induced pulsing did not substantiate any practically useful effect. © 2005 American Institute of Chemical Engineers AIChE J, 2005
Mixed conducting ceramic hollow‐fiber membranes for air separation
Authors: Tan Xiaoyao , Liu Yutie , Li K. 
Published: May 2005

AbstractMixed conducting ceramic hollow‐fiber membranes, which possess an asymmetric structure, were prepared by a combined phase inversion and sintering technique where precursors of the hollow fibers were first spun using a polymer solution containing suspended LSCF powders and were then sintered at elevated temperature. By controlling the weight ratio of the LSCF powder to the polymer binder, sintering temperature, and time, the LSCF hollow fibers with gastight properties have been prepared and evaluated using an apparatus developed during the course of this study. Using the gastight LSCF hollow fibers, a membrane module was assembled for air separation. The performances of the module for air separation have been studied under various operating modes and at different temperatures and feed flow rates both experimentally and theoretically. The results reveal that the surface exchange reaction at the downstream side is much more important than that at the upstream side, especially for lower operating temperatures. The porous inner surface of the prepared LSCF hollow‐fiber membranes substantially favors the oxygen permeation when air is fed in the shell side of the membrane module. At high operating temperatures, oxygen permeation can be enhanced by the countercurrent flow operation. Vacuum operation favors the oxygen permeation kinetically in the LSCF hollow‐fiber membrane modules. © 2005 American Institute of Chemical Engineers AIChE J, 2005
Shprintzen–Goldberg syndrome: Fourteen new patients and a clinical analysis
Authors: Robinson Peter N. , Neumann Luitgard M. , Demuth Stephanie , Enders Herbert , Jung Ursula , König Rainer , Mitulla Beate , Müller Dietmar , Muschke Petra , Pfeiffer Lutz , Prager Bettina , Somer Mirja , Tinschert Sigrid 
Published: May 2005

AbstractThe Shprintzen–Goldberg syndrome (SGS) is a disorder of unknown cause comprising craniosynostosis, a marfanoid habitus and skeletal, neurological, cardiovascular, and connective‐tissue anomalies. There are no pathognomonic signs of SGS and diagnosis depends on recognition of a characteristic combination of anomalies. Here, we describe 14 persons with SGS and compare their clinical findings with those of 23 previously reported individuals, including two families with more than one affected individual. Our analysis suggests that there is a characteristic facial appearance, with more than two thirds of all individuals having hypertelorism, down‐slanting palpebral fissures, a high‐arched palate, micrognathia, and apparently low‐set and posteriorly rotated ears. Other commonly reported manifestations include hypotonia in at least the neonatal period, developmental delay, and inguinal or umbilical hernia. The degree of reported intellectual impairment ranges from mild to severe. The most common skeletal manifestations in SGS were arachnodactyly, pectus deformity, camptodactyly, scoliosis, and joint hypermobility. None of the skeletal signs alone is specific for SGS. Our study includes 14 mainly German individuals with SGS evaluated over a period of 10 years. Given that only 23 other persons with SGS have been reported to date worldwide, we suggest that SGS may be more common than previously assumed. © 2005 Wiley‐Liss, Inc.
Association of migraine‐like headaches with Schimke immuno‐osseous dysplasia
Authors: Kilic Sara Sebnem , Donmez Osman , Sloan Emily A. , Elizondo Leah I. , Huang Cheng , André Jean‐Luc , Bogdanovic Radovan , Cockfield Sandra , Cordeiro Isabel , Deschenes Georges , Fründ Stefan , Kaitila Ilkka , Lama Giuliana , Lamfers Petra , Lücke Thomas , Milford David V. , Najera Lydia , Rodrigo Francisco , Saraiva Jorge M. , Schmidt Beate , Smith Graham C. , Stajic Nastasa , Stein Anja , Taha Doris , Wand Dorothea , Armstrong Dawna , Boerkoel Cornelius F. 
Published: May 2005

AbstractSchimke immuno‐osseous dysplasia (SIOD) is characterized by spondyloepiphyseal dysplasia, nephropathy, and T‐cell deficiency. SIOD is caused by mutations in the putative chromatin remodeling protein SMARCAL1. We report an 8‐year‐old boy with SIOD and recurrent, severe, refractory migraine‐like headaches. Through a retrospective questionnaire‐based study, we found that refractory and severely disabling migraine‐like headaches occur in nearly half of SIOD patients. We have also found that the vasodilator minoxidil provided symptomatic relief for one patient. We hypothesize that these headaches may arise from an intrinsic vascular, neuroimmune, or neurovascular defect resulting from loss of SMARCAL1 function. © 2005 Wiley‐Liss, Inc.
High rate treatment of terephthalic acid production wastewater in a two‐stage anaerobic bioreactor
Authors: Kleerebezem Robbert , Beckers Judith , Hulshoff Pol Look W. , Lettinga Gatze 
Published: May 2005

AbstractThe feasibility was studied of anaerobic treatment of wastewater generated during purified terephthalic acid (PTA) production in two‐stage upflow anaerobic sludge blanket (UASB) reactor system. The artificial influent of the system contained the main organic substrates of PTA‐wastewater: acetate, benzoate, and terephthalate. Three parallel operated reactors were used for the second stage, and seeded with a suspended terephthalate degrading culture, with and without additional methanogenic granular sludge (two different types). The first stage UASB‐reactor was seeded with methanogenic granular sludge. Reactors were operated at 37°C and pH 7. During the first 300 days of operation a clear distinction between the biomass grown in both reactor stages was obtained. In the first stage, acetate and benzoate were degraded at a volumetric loading rate of 40 g‐COD/L · day at a COD‐removal efficiency of 95% within the first 25 days of operation. No degradation of terephthalate was obtained in the first stage during the first 300 days of operation despite operation of the reactor at a decreased volumetric loading rate with acetate and benzoate of 9 g‐COD/L · day from day 150. Batch incubation of biomass from the reactor with terephthalate showed that the lag‐phase prior to terephthalate degradation remained largely unchanged, indicating that no net growth of terephthalate degrading biomass occurred in the first stage reactor. From day 300, however, terephthalate degradation was observed in the first stage, and the biomass in this reactor could successfully be enriched with terephthalate degrading biomass, resulting in terephthalate removal capacities of 15 g‐COD/L · day. Even though no single reason could be identified why (suddenly) terephthalate degradation was obtained after such a long period of operation, it is suggested that the solid retention time as well the prevailing reactor concentrations acetate and benzoate may have played an important role. From day 1 of operation, terephthalate was degraded in the second stage. In presence of methanogenic granular biomass, high terephthalate removal capacities were obtained in these reactors (15 g‐COD/L · day) after approximately 125 days of operation. From the results obtained it is concluded that terephthalate degradation is the bottleneck during anaerobic treatment of PTA‐wastewater. Pre‐removal of acetate and benzoate in staged bioreactor reduces the lag‐phase prior to terephthalate degradation in latter stages, and enables high rate treatment of PTA‐wastewater. © 2005 Wiley Periodicals, Inc.
Syntheses, Band Structures and Optical Properties of Zn3B2O6 and KZn4B3O9.
Authors: Chen D.‐G. , Cheng W.‐D. , Wu D.‐S. , Zhang H. , Zhang Y.‐C. , Gong Y.‐J. , Kan Z.‐G. 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Tin/Platinum Bimetallic Nanotube Array and Its Electrocatalytic Activity for Methanol Oxidation.
Authors: Guo Yu‐Guo , Hu Jin‐Song , Zhang Hui‐Min , Liang Han‐Pu , Wan Li‐Jun , Bai Chun‐Li 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Synthetic Studies Using Unsaturated and Active Phosphonium Salts. A Convenient Preparation of Furano‐ and Pyrano[2,3‐c]pyridazines and Substituted Quinolines.
Authors: Abdou Wafaa M. , Ganoub Neven A. , Fahmy Amin F. , Shaddy Abeer M. 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Selective Reduction of Carbonyl Compounds with B‐Phenoxydiisopinocampheylborane: Comparison of Its Reactivity to the Cyclohexoxy Derivative.
Authors: Cha Jin Soon , Nam Ho Tae , Jang Seung Ho , Kwon Sang Young , Park Seung Jin , Kwon Oh Oun 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
The Trimethylsilyl Xylyl (TIX) Ether: A Useful Protecting Group for Alcohols.
Authors: Reddy Ch. Raji , Chittiboyina Amar G. , Kache Rajashaker , Jung Jae‐Chul , Watkins E. Blake , Avery Mitchell A. 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
One‐Pot Synthesis of 1‐Aryl‐3‐methyl‐1,3‐dienes Using Methallyl(trimethyl)silane and Aldehydes and Their Low Temperature (Z)→(E) Isomerization Induced by Sulfur Dioxide.
Authors: Dubbaka Srinivas Reddy , Vogel Pierre 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Synthetic Chalcones as Potential Antiinflammatory and Cancer Chemopreventive Agents.
Authors: Won Shen‐Jeu , Liu Cheng‐Tsung , Tsao Lo‐Ti , Weng Jing‐Ru , Ko Horng‐Huey , Wang Jih‐Pyang , Lin Chun‐Nan 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
P,N‐Bidentate Aryl Phosphite Ligands Based on Chiral 2‐Imino‐, 2‐Oxazolinyl and 2‐Oxazolidinyl Phenols and Their Catalytic Activity.
Authors: Gavrilov Konstantin N. , Tsarev Vasily N. , Zheglov Sergey V. , Lyubimov Sergey E. , Shyryaev Alexei A. , Petrovskii Pavel V. , Davankov Vadim A. 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Catalytic Asymmetric Arylative Cyclization of Alkynals: Phosphine‐Free Rhodium/Diene Complexes as Efficient Catalysts.
Authors: Shintani Ryo , Okamoto Kazuhiro , Otomaru Yusuke , Ueyama Kazuhito , Hayashi Tamio 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Heterocyclic Derivatives of Fullerene C60. Part 2. Cycloaddition to Fullerene C60 of the Products of Dehydrochlorination of N‐Benzyltrifluoroacetimidoyl Chlorides.
Authors: Reinov M. V. , Yurovskaya M. A. , Streletskiy A. V. , Boltalina O. V. 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
A Soluble Pentacene: Synthesis, EPR and Electrochemical Studies of 2,3,9,10‐Tetrakis(trimethylsilyl)pentacene.
Authors: Chan Siu Hin , Lee Hung Kay , Wang Yu Man , Fu Nan Yan , Chen Xiao Ming , Cai Zong Wei , Wong Henry N. C. 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
A Facile and Efficient Synthesis of 3,5‐Disubstituted Tetronic Acids in Aqueous Media Involving Acid‐Catalyzed Intramolecular Oxa‐Pyridylethylation.
Authors: Bi Xihe , Liu Qun , Sun Shaoguang , Liu Jun , Pan Wei , Zhao Lei , Dong Dewen 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Diastereoselective Metal‐Catalyzed [4 + 2 + 2] Carbocyclization Reactions Utilizing a Rhodium N‐Heterocyclic Carbene (NHC) Complex: The First Example of a Rhodium NHC‐Catalyzed [m + n + o] Carbocyclization.
Authors: Evans P. Andrew , Baum Erich W. , Fazal Aleem N. , Pink Maren 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Re(CO)5Br‐Catalyzed Coupling of Epoxides with CO2 Affording Cyclic Carbonates under Solvent‐Free Conditions.
Authors: Jiang Jia‐Li , Gao Feixue , Hua Ruimao , Qiu Xianqing 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Derivatives of α,β‐Dehydro Amino Acids. Part 1. Synthesis of 1‐Aryl‐2,4‐disubstituted Imidazol‐5‐ones from Arylamides of N‐Benzoyl‐α,β‐dehydrophenylalanine and Trimethylchlorosilane.
Authors: Topuzyan V. O. , Oganesyan A. A. , Panosyan G. A. 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Chemoenzymatic Synthesis of Stannylated Metomidate as a Precursor for Electrophilic Radiohalogenations — Regioselective Alkylation of Methyl 1H‐Imidazole‐5‐carboxylate.
Authors: Hammerschmidt Friedrich , Simov Biljana Peric , Schmidt Susanne , Schneider Sabine , Zolle Ilse 
Published: May 2005

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The Reaction of Acetylenic Amines with Tetraethylammonium Carbonate and Hydrogen Carbonate: Synthesis of 5‐Methylene‐1,3‐oxazolidin‐2‐ones.
Authors: Arcadi Antonio , Inesi Achille , Marinelli Fabio , Rossi Leucio , Verdecchia Mirella 
Published: May 2005

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Diels—Alder Reactions of 2‐Oxazolidinone Dienes in Polar Solvents Using Catalysis or Non‐Conventional Energy Sources.
Authors: Fuentes Aydee , Martinez‐Palou Rafael , Jimenez‐Vazquez Hugo A. , Delgado Francisco , Reyes Alicia , Tamariz Joaquin 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Intramolecular 1,3‐Dipolar Cycloaddition of Cyclo‐1,3‐diene‐tethered Nitrile Oxides.
Authors: Yeh Ming‐Chang P. , Jou Chi‐Fen , Yeh Wei‐Tzou , Chiu Da‐yu , Reddy N. Ravi Kumar 
Published: May 2005

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A Novel Entry Toward 2‐Imino‐1,3‐thiazolidines and 2‐Imino‐1,3‐thiazolines by Ring Transformation of 2‐(Thiocyanomethyl)aziridines.
Authors: D'hooghe Matthias , Waterinckx Alex , De Kimpe Norbert 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Mercury(II) Chloride Mediated Cyclization—Rearrangement of O‐Propargylglycolaldehyde Dithioacetals to 3‐Pyranone Dithioketals: An Expeditious Access to 3‐Pyranones.
Authors: Ghorai Subir , Bhattacharjya Anup 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Reactivity of N‐Alkanoyloxy‐2,2,6,6‐tetramethylpiperidines (O‐AcylTEMPOs) Towards Hydride‐Transferring or Metallic Alkylating Reagents; Unprecedented Stability and Application to Chemoselective Transformations.
Authors: Inokuchi Tsutomu , Kawafuchi Hiroyuki , Nokami Junzo 
Published: May 2005

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Search for Histamine H3 Receptor Antagonists with Combined Inhibitory Potency at Nτ‐Methyltransferase: Ether Derivatives.
Authors: Apelt J. , Grassmann S. , Ligneau X. , Pertz H. H. , Ganellin C. R. , Arrang J.‐M. , Schwartz J.‐C. , Schunack W. , Stark H. 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
An Easy ABD→ABCD Strategy to Indolo[2,3‐a]quinolizin‐4‐one. Synthesis of Deplancheine and Yohimbane.
Authors: Chang Meng‐Yang , Chen Chung‐Yi , Chung Wen‐Shang , Tasi Min‐Ruei , Chang Nein‐Chen 
Published: May 2005

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Acetyl Derivatives of 3‐(5‐R‐Amino‐ [1,3,4]thiadiazol‐2‐yl)‐5‐hydroxymethyl‐8‐methyl‐2H‐pyrano [2,3‐c]pyridin‐2‐ones
Authors: Zhuravel' I. A. , Kovalenko S. N. , Chernykh V. P. , Shinkarenko P. E. 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Non‐Imidazole Histamine H3 Ligands. Part 3. New 4‐n‐Propylpiperazines as Non‐Imidazole Histamine H3‐Antagonists.
Authors: Walczynski Krzysztof , Zuiderveld Obbe P. , Timmerman Henk 
Published: May 2005

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Isomerization in the Oxidative Cyclocondensation of 2‐Aroylmethyl‐1H‐benzimidazoles with o‐Aminothiophenol.
Authors: Dzvinchuk I. B. , Vypirailenko A. V. , Lozinskii M. O. 
Published: May 2005

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Synthesis of 3‐Aryl(hetaryl)‐1,2,3‐diazaphospholines.
Authors: Chaikovskaya Aleksandra A. , Kudrya Tamara N. , Lakhtadir Aleksandr I. , Smaliy Radomir V. , Pinchuk Aleksandr M. , Tolmachev Andrei A. 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Regio‐ and Stereoselective Synthesis of Z‐Vinylic Tellurides from Propargylic Alcohols: A Route to Chiral Z‐Enynes.
Authors: Raminelli Cristiano , da Silva Nathalia C. , Dos Santos Alcindo A. , Porto Andre L. M. , Andrade Leandro H. , Comasseto Joao V. 
Published: May 2005

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Hydrazine Hydrate Induced Reductive Cleavage of α,β‐Epoxy Ketones: An Efficient Procedure for the Preparation of β‐Hydroxy Ketones.
Authors: Salvador Jorge A. R. , Leitao Alcino J. L. , Sa e Melo M. Luisa , Hanson James R. 
Published: May 2005

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Protoberberines from Reissert‐Compounds. Part 9. An Alternative Approach to Dibenzoquinolizine‐ and Isoquinonaphthyridin‐13a‐carboxylic Acids, a Novel Synthesis of Alangimarine.
Authors: Reimann Eberhard , Grasberger Fritz 
Published: May 2005

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Production of an Antiproliferative Furanoheliangolide by Lychnophora ericoides Cell Culture.
Authors: dos Santos Pierre Alexandre , Castro Amarante Maria Fernanda , Soares Pereira Ana Maria , Bertoni Bianca , Castro Franca Suzelei , Pessoa Claudia , de Moraes Manoel Odorico , Costa‐Lotufo Leticia Veras , Pinho Pereira Marcio Roberto , Lopes Norberto Peporine 
Published: May 2005

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Tyrosinase Inhibitors from Rhododendron collettianum and Their Structure—Activity Relationship (SAR) Studies.
Authors: Ahmad Viqar Uddin , Ullah Farman , Hussain Javid , Farooq Umar , Zubair Muhammad , Khan Mahmud Tareq Hassan , Choudhary Muhammad Iqbal 
Published: May 2005

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Matrix Metalloproteinase‐1 Inhibitor from the Stem Bark of Styrax japonica S. et Z.
Authors: Kim Mi‐Ran , Moon Hyung‐In , Chung Jin Ho , Moon Young Hee , Hahm Kyung‐Soo , Woo Eun‐Rhan 
Published: May 2005

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Two New Lactones and One New Aryl‐8‐oxa‐bicyclo[3,2,1]oct‐3‐en‐2‐one from Descurainia sophia.
Authors: Sun Kai , Li Xian , Li Wen , Wang Jinhui , Liu Jianming , Sha Yi 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.
Dithiol Proteins as Guardians of the Intracellular Redox Milieu in Parasites: Old and New Drug Targets in Trypanosomes and Malaria‐Causing Plasmodia
Authors: Krauth‐Siegel R. Luise , Bauer Holger , Schirmer R. Heiner 
Published: May 2005

AbstractFor Abstract see ChemInform Abstract in Full Text.