bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis and Characterization of Metal Complexes Derived from Potassium 3‐(Benzotriazole‐1‐carbonylmethyl)‐dithiocarbazate
Authors: Xu Peng‐Fei , Liu Zhang‐Lu , Wu Shao‐Zu 
Published: September 2010

AbstractThe preparation and characterization of some dipositive metal ion complexes derived from potassium 3‐(benzotriazole‐1‐carbonylmethyl)‐dithiocarbazate (BCDHK) is reported. The solid complexes of the composition ML · nH2O (M = Mn(II), Ni(II), Cu(II), Cd(II), Zn(II) and Co(II), n = 0,1) and ML2 · 2H2O (M = Pb (II), UO2(VI)), have been characterized on the basis of elemental analyses, IR, UV and TGA. IR spectral data indicate that BCDHK behaves as either a mononegative or binegative ligand and coordinates in a tridentate or bridging tetradentate manner.
X‐Ray K‐Absorption Spectroscopic Studies of Some Cobalt(II) Complexes
Authors: Kekre P. A. , Joshi K. P. , Mishra Ashutosh , Chaturvedi K. K. 
Published: September 2010

AbstractX‐ray K‐absorption spectra of some cobalt(II) complexes of newly synthesized mannich bases of biological interest have been studied using Seifert X‐ray generator and Cauchois type bent crystal X‐ray spectrograph of 0.4 m radius. The observed X‐ray parameters, e.g. chemical shift, shift of principal absorption maximum, edge‐width, effective nuclear charge and percentage covalency have been used to explain the structure of the complexes, and these parameters have also been correlated with earlier chemical studies.
Regioselective Synthesis of 9‐[(2‐Hydroxyethoxy)Methyl]‐6‐Benzylaminopurine Analogue of Acyclovir
Authors: Taha Mohamed L , Lazrek Hassan B. 
Published: September 2010

AbstractThe 6‐benzylaminopurine 1 has been alkylated with (2‐acetoxyethoxy)methylbromide 3, using trimethylsilylation and phase transfer catalysis procedures. The influence of the base, the solvent and the catalyst were studied. When the solid‐liquid phase transfer catalysis was conducted in tetrahydrofuran in the presence of the potassium tert‐butoxide and 18‐crown‐6, the reaction was regioselective to give 9‐[(2‐acetoxyethoxy)methyl]‐6‐benzylaminopurine 5 in 80% yield.
Desorption Process of Lindane, Chlorothalonil, Vinclozolin, Dichlofluanid and Triadimefon from Trapping Sorbents
Authors: Vidal J. L MartÍNez , Mart Galera M. ÍNez , González F. J. Egea , Cano M. L. Castro 
Published: September 2010

AbstractThe desorption process of five organochlorine pesticides from polyurethane foam (PUF), Chromosorb, Porapak R, Supelpak, XAD‐2 and XAD‐4 has been studied. Acetone and n‐hexane:petroleum ether (85:15 v/v) have been compared to select the best solvent to re‐extract the sorbed analytes. Sonication and Soxhlet extraction have also been compared in order to achieve the best operatory conditions.
Antidepresseurs Potentiels: Synthese et Stereochimie de 2,3,4,4a,9,9a‐Hexahydro‐9‐Phenyl‐1H‐Indeno[1,2‐B]Pyrazines
Authors: Chahboun S. , Gelbcke M. , Smith D. F. 
Published: September 2010

AbstractThe synthesis of various diastereoisomeric (±) H4a,H9a‐trans,H9,H9a‐cis‐ (VIII) and H4a,H9a‐trans, H9,H9a‐trans‐2,3,4,4a,9,9a‐hexahydro‐9‐phenyl‐1H‐indeno[1,2‐b]pyrazines (IX) is described, using as key step for piperazine ring formation an alkoxyphosphonium salt. CompoundIXawas prepared as a putative serotonin reuptake inhibitor.
Crystal Structure of (4R,5R)‐2‐Ethoxy‐4,5‐Bis[(1‐Methoxy‐1‐Phenyl)Benzyl]‐1,3‐Dioxolane
Authors: Feneau‐Dupont J. , Declercq J. P. , Patiny L. 
Published: September 2010

AbstractC66H68O10, Mr = 1021.2, orthorhombic, P212121, a = 11.038(4), b = 14.183(6), c = 18.358(7)Å, V = 2874(2)Å3, Z = 2, Dx = 1.18g.cm−3, MoKα radiation (λ = 0.71069Å). The final R indice is 0.080 for 1033 observed reflections
1,1′‐diacetylferrocene‐bis(s‐methyldithiocarbazaone) and its lanthanide chelates: Synthesis and spectral investigation
Authors: Gang Zhao , Yuan Cao , Yongxiang Ma 
Published: September 2010

AbstractA new ligand, 1,1′‐diacetylferrocene‐bis (S‐methyldithiocarbazaone) (H2Dafmt) and its lanthanide (III) chelates Ln(Dafmt)CI (Ln = Ln∼Lu, except Pm) have been prepared and characterized by elemental analyses, IR, UV, 1H NMR, electrolytic conductivities and TGA measurement. It is shown that the ligand coordinates to the Ln3+ ion in the thiol‐form and with one chloride ion participated in the coordination as well. These chelates are non‐electrolytes in DMF and more thermostable than the ligand due to the formation of the chelate rings.
Surface‐Promoted Dissociation of RhCO3(CO)12 to Monometallic Clusters by CO, as Studied by IR Spectroscopy
Authors: Huang Lin 
Published: September 2010

AbstractThe reactivity of SiO2‐supported RhCo3(CO)12 with CO has been studied by IR spectroscopy at room temperature. Under 13 KPa of CO SiO2‐supported RhCo3(CO)12 progressively dissociates to Rh6(CO)16 and Co4(CO)12 and high conversion of RhCo3(CO)12 is qualitatively determined according to spectroscopic observations. From the surface reaction mixture, the mixture of Co4(CO)12 and RhCo3(CO)12can be first extracted with n‐hexane and subsequently Rh6(CO)16 can be extracted with tetrahydrofuran (THF). The extraction of these products from the surface confirms the results of in situ study. Additional IR study shows that the dissociation of RhCo3(CO)12 does not take place in solution under atmospheric CO pressure and at room temperature. These results unambiguously indicate that the interaction of SiO2 with RhCo3(CO)12 is responsible for the dissociation of RhCo3(CO)12 under CO.
Synthesis of Some 4‐Substituted 1‐(4‐Hydroxybutyl)Pyrazolo‐[3,4‐D]Pyrimidine Analogues of 9‐(4‐Hydroxybutyl)Guanine (HBG)
Authors: Taha Mohamed L. , Lazrek Hassan B. 
Published: September 2010

AbstractThe chemical synthesis of some 4‐substituted 1‐(4‐hydroxybutyl)pyrazolo[3,4‐d]pyrimidines was described. Using solid‐liquid phase transfer catalysis, the 4‐alkylthio‐1‐(4‐acetoxybutyl)pyrazolo[3,4‐d]pyrimidines 3a‐c were regioselectively prepared in good yields. The influence of the solvent, the catalyst and the base on yields of the reaction was investigated. The carboacyclonucleoside 4‐methylthio‐1‐(4‐hydroxybutyl)pyrazolo[3,4‐d]pyrimidine 4a was served as the precursor for the preparation of the 4‐methylamino 4d, 4‐dimethylamino 4e, 4‐benzylamino 4f, 4‐amino 4g and 4‐methoxy 4h analogues.
Mise au Point Sur la Conformation de Derives Thiopheniques
Authors: Garrigues Bernard , Oussaid Boualem , Moeini Leila , Hubert Cathy , Soufiaoui Mohammed 
Published: September 2010

AbstractIn this review an account of the numerous works related to the determination of the conformation in solution of thiophenic compounds is given. Most of the studies were effected by dipole moment measurement, infrared and microwave absorption, or theoretical calculations. NMR spectrometry was employed as a priviledged tool in many cases, using the measurements of the stereospecific coupling constants across five bonds. An interpretation of the results is proposed.
Synthesis of Triaryl Cyanurates Catalysed by Polyethylene Glycol in a Two‐Phase System: Phase Transfer Catalysis
Authors: Kavitake Bhanudas P. , Patil Sucheta V. , Salunkhe Manikrao M. , Wadgaonkar Prakash P. 
Published: September 2010

AbstractThe synthesis of triaryl cyanurates (2,4,6‐triaryloxy‐1,3,5‐triazines) was accomplished at room temperature in high yields in a two‐phase system using PEG‐400 as a phase transfer catalyst.
Half‐Wave Potentials of 1‐AZA‐ and 1,8‐Diazaanthraquinones
Authors: Díaz‐Guerra Luis M. , Ocaña Blanca , Pérez José Maria , Avendaño Carmen , Espada Modesta , Menéndez J. Carlos , Ramos M. Teresa , Ruiz M. AsuncióN , Pingarrón José M. , Salvatierra Dolors , Jaime Carlos 
Published: September 2010

AbstractThe redox properties of a series of 1‐azaanthracene‐9,10‐diones, 1,8‐diazaanthracene‐9,10‐diones, 1,8‐diazaanthracene‐(1H)2,9,10‐triones and 1,8‐diazaanthracene‐(1H, 8H)2,7,9,10‐tetraones have been studied. The results obtained show that the 2‐pyridone moiety is a stronger electron acceptor than the pyridine ring, in agreement with reactivity data. 1‐Hydroxy‐1‐azaanthracene‐2,9,10‐triones, synthesized from 1‐azaanthracene‐9,10‐dione‐N‐oxides, show redox properties close to 1,8‐diazaanthracene‐2,7,9,10‐tetraones, and therefore the cyclic hydroxamic acid unit behaves also as an strong electron acceptor. Voltammetric half‐wave first potentials correlate with the energies of the LUMO in model compounds.
A new Approach to the Microradiographic Evaluation of Root Surface Erosion Lesions
Authors: Verbeeck Ronald M. H. , Surmont Paul A. S. , Vergauwe Donald A. G. , De Maeyer Erna A. P. 
Published: September 2010

AbstractAlthough microradiography is considered to provide qualitative as well as quantitative information about the demineralization process of root surfaces, there are several difficulties, especially when dealing with an erosive lesion type. The present study proposes a new approach to microradiographic evaluation which can solve some of the problems. A procedure for determining the position of the original surface of any erosive lesion site is presented, thereby tracking this position with an accuracy of 23 μm. Biologic variations and processing related factors, resulting in distorted surface as well as mineral profiles can be adjusted by normalizing the lesion profile with respect to the mineral profile of adjacent border fields. A routine is described by which the former is related to its pre‐demineralization status. The mineral loss is expressed as relative mineral loss (RML), a quantity which is introduced as an alternative to the widely used absolute value ΔZ.
Conjugation of Oligonucleotides to 3′‐Polar Moieties
Authors: van Aerschot Arthur , Saison‐Behmoaras Tula , Rozenski Jef , Hendrix Chris , Schepers Guy , Verhoeven Geert , Herdewijn Piet 
Published: September 2010

AbstractSeveral small diol moieties have been coupled to antisense oligonucleotides through preparation of the respectively modified supports. These 3′‐polar conjugates all increased the antisense properties of the constructs to a large extent.
Synthesis of E/Z‐(R)‐1‐[4‐(4‐Methoxyphenyl)‐4‐Phenyl‐3‐Butenyl]‐3‐Piperidinecarboxylic Acid
Authors: Vandersteene Isabel , Slegers Guido 
Published: September 2010

AbstractA synthesis for E/Z‐(R)‐1‐[4‐(4‐methoxyphenyl)‐4‐phenyl‐3‐butenyl]‐3‐piperidinecarboxylic acid (1) is described, starting from 4‐hydroxybenzophenone, utilizing a Grignard reaction with cyclopropyl magnesium bromide, intra‐rearrangement of the resulting carbinol and coupling of the butenyl bromide with the ethyl ester of (R)‐nipecotic acid, followed by an alkylation reaction and hydrolysis of the ester.
Outcomes from patients with multi‐vessel disease following primary PCI
Authors: Barringhaus Kurt G. , Park Kay Lee , McManus David D. , Steg Philippe Gabriel , Montalescot Gilles , Van de Werf Frans , López‐Sendón José , FitzGerald Gordon , Gore Joel M. ,   for the GRACE Investigators
Published: September 2010

AbstractBackground: CABG and PCI are effective means for revascularization of patients with multi‐vessel coronary artery disease, but previous studies have not focused on treatment of patients that first undergo primary PCI. Methods: Among patients enrolled in the global registry of acute coronary events (GRACE), clinical outcomes for patients presenting with STEMI treated with primary PCI were compared according to whether residual stenoses were treated medically, surgically, or with staged PCI. Clinical characteristics and data pertaining to major adverse cardiac events during hospitalization and 6 months after discharge were collected. Results: Of the 1,705 patients included, 1,345 (79%) patients were treated medically, 303 (18%) underwent staged PCI, and 57 (3.3%) underwent CABG following primary PCI. Hospital mortality was lowest among patients treated with staged PCI (Medical = 5.7%; PCI = 0.7%; CABG = 3.5%; P < 0.001 [PCI vs. Medical]), a finding that persisted after risk adjustment (Odds Ratio PCI vs. Medical = 0.16, [0.04–0.68]; P = 0.01). Six month postdischarge mortality likewise was lowest in the staged PCI group (Medical = 3.1%; PCI = 0.8%; CABG = 4.0%; P = 0.04 [PCI vs. Medical]). Patients revascularized surgically were rehospitalized less frequently (Medical = 20%; PCI = 19%; CABG = 6.3%; P < 0.05) and underwent fewer unscheduled procedures (Medical = 9.8%; PCI = 10.0%; CABG = 0.0%; P < 0.02). Conclusions: The results of this multinational registry demonstrate that hospital mortality in patients who undergo staged percutaneous revascularization of multivessel coronary disease following primary PCI is very low. Patients undergoing CABG following primary PCI are hospitalized less frequently and undergo fewer unplanned catheter‐based procedures. © 2011 Wiley‐Liss, Inc.
Neuroprotection during carotid artery stenting using the GORE flow reversal system: 30‐day outcomes in the EMPiRE Clinical Study
Authors: Clair Daniel G. , Hopkins L. Nelson , Mehta Manish , Kasirajan Karthikeshwar , Schermerhorn Marc , Schönholz Claudio , Kwolek Christopher J. , Eskandari Mark K. , Powell Richard J. , Ansel Gary M. ,   for the EMPiRE Clinical Study Investigators
Published: September 2010

AbstractBackground: Each of the embolic protection devices used in carotid artery stenting (CAS) has advantages and disadvantages. The prospective, multicenter, single‐arm EMPiRE Clinical Study investigated a proximally placed device (GORE Flow Reversal System) that provides distal neuroprotection during CAS by reversing blood flow in the internal carotid artery, thereby directing emboli away from the brain. Methods: The study evaluated 30‐day outcomes in 245 pivotal high‐surgical‐risk patients (mean age, 70 years; 32% symptomatic; 16% ≥80‐years old) with carotid stenosis who underwent CAS using the flow reversal system. The primary endpoint was a major adverse event (MAE; stroke, death, myocardial infarction, or transient ischemic attack) within 30 days of CAS. The MAE rate was compared with an objective performance criterion (OPC) derived from CAS studies that included embolic protection. Results: The MAE rate was 4.5% (11 patients; P = 0.002 compared with the OPC). The stroke and death rate was 2.9%. No patient had a major ischemic stroke. Six patients (2.4%) had intolerance to flow reversal. The death and stroke rates in the symptomatic, asymptomatic, and octogenarian subgroups were 2.6, 3, and 2.6%, respectively, meeting American Heart Association guidelines for carotid endarterectomy. Conclusion: The stroke and death rate in this study was among the lowest in CAS trials. The results indicate that the flow reversal system is safe and effective when used for neuroprotection during CAS and that it provides benefits in a broad patient population. © 2010 Wiley‐Liss, Inc.
Percutaneous device closure of congenital and iatrogenic ventricular septal defects in adult patients
Authors: Al‐Kashkari Wail , Balan Prakash , Kavinsky Clifford J. , Cao Qi‐Ling , Hijazi Ziyad M. 
Published: September 2010

AbstractObjectives: We report our 10‐year experience with percutaneous closure of adult congenital and acquired (non‐post‐infarct) ventricular septal defects (VSDs) using different types of Amplatzer occluder devices. Background: Adult congenital and acquired VSDs may produce significant morbidity and mortality. Furthermore, such VSDs pose a significant surgical challenge. Methods: Between February 2000 and August 2009, data were retrospectively reviewed from 28 patients who underwent 29 procedures for percutaneous device closure of hemodynamically significant VSDs. Seventeen had unrepaired congenital VSDs, 10 had post‐operative VSDs (5 with residual patch‐margin defects, 4 post‐aortic valve replacement, 1 post‐myomectomy), and one had an acquired traumatic VSD. Indications for closure included: symptoms related to significant shunt (dyspnea on exertion); unexplained deterioration of LV function, and/or LV dilation; recurrent endocarditis, and pulmonary hypertension. Outcome parameters were procedural success, procedure‐related complications, evidence of residual shunt by echocardiography, and improvement in the signs/symptoms for which the procedure was performed. The mean follow‐up interval was 68 months. Results: Of the 28 patients studied, a single VSD was present in 26 patients, while one patient had two defects, and one patient had one defect on the LV side with three openings at the RV side. The median size of the defects by echocardiography was 6 mm. A device was successfully implanted in 28 of 29 (97%) procedures and 28 of 28 (100%) patients. Procedure‐related complications occurred in two cases: one involving an access site hematoma not requiring transfusion as well as nonsustained ventricular tachycardia that resolved spontaneously and the other involving acute mitral regurgitation due to inadvertent trapping of the anterior mitral valve leaflet between the left ventricular disk and the septum that was resolved by recapturing of the disk. There was immediate complete closure in 20 patients (71%). In six cases there was trivial residual shunt and in two patients the residual shunt was mild. At the latest follow‐up, four of the eight with a residual shunt had no shunt and in the remaining four the residual shunt was trivial. Among symptomatic patients 18 (64%), there was marked improvement in symptoms and for those patients 17 (61%) for whom the procedure was performed to address left ventricular enlargement, there was reduction or stabilization in LV size on serial echoes. Conclusions: Percutaneous closure of VSDs in the adult patient appears to be safe and effective. © 2010 Wiley‐Liss, Inc.
Extended follow‐up safety and effectiveness of the Endeavor zotarolimus‐eluting stent in real‐world clinical practice: Two‐year follow‐up from the E‐Five Registry
Authors: Meredith Ian , Rothman Martin , Erglis Andrejs , Parikh Keyur , Lotan Chaim ,   for the E‐Five Investigators
Published: September 2010

AbstractObjectives: To present data from the cohort of patients in the all‐comers Endeavor zotarolimus‐eluting stent (ZES) registry (E‐Five) who underwent 2‐year follow‐up. Background: The Endeavor ZES has been shown to be safe and efficacious for treatment of single, de novo lesions in patients with stable coronary artery disease. E‐Five evaluated the ZES in over 8,000 real‐world patients, at 188 sites followed to 1 year. A subset of sites continued follow‐up through 2 years to evaluate late‐term safety and effectiveness of the ZES in this population with diverse clinical and lesion characteristics. Methods: E‐Five, a prospective, multicenter, nonrandomized global registry, collected 2‐year outcomes for 2,116 patients from 26 centers. Sites were selected for participation based on patient accrual rates and the ability to continue follow‐up activities for an additional year. Complete data was available for 2,054 patients. To observe whether or not a sustained benefit was achieved, data for all patients from the selected sites were included in the analysis. Results: The outcomes in the 2‐year cohort tracked with the results of randomized controlled trials using the Endeavor ZES. One year results were MACE 7.5%, TLR 4.5%, and ARC definite/probable stent thrombosis 0.6%. Outcomes at 2 years for MACE, TLR, and ARC definite/probable stent thrombosis were 8.5, 5.1, and 0.7%, respectively. Conclusions: Long‐term efficacy and safety outcomes were maintained between 1 and 2 years for the 2‐year patient cohort, with only a small number of additional MACE, TLR, and very late stent thrombosis events. © 2010 Wiley‐Liss, Inc.
Simple Preparation and Application of TEMPO‐Coated Fe3O4 Superparamagnetic Nanoparticles for Selective Oxidation of Alcohols
Authors: Tucker‐Schwartz Alexander K. , Garrell Robin L. 
Published: September 2010

AbstractThe organic oxidant TEMPO (2,2,4,4‐tetramethylpiperdine‐1‐oxyl) was immobilized on iron oxide (Fe3O4) superparamagnetic nanoparticles by employing strong metal‐oxide chelating phosphonates and azide/alkyne “click” chemistry. This simple preparation yields recyclable TEMPO‐coated nanoparticles with good TEMPO loadings. They have excellent magnetic response and efficiently catalyze the oxidation of a wide range of primary and secondary alcohols to aldehydes, ketones, and lactones under either aerobic acidic MnII/CuII oxidizing Minisci conditions, or basic NaOCl Anelli conditions. The nanoparticles could be recycled more than 20 times under the Minisci conditions and up to eight times under the Anelli conditions with good to excellent substrate conversions and product selectivities. Immobilization of the catalyst through a phosphonate linkage allows the particles to withstand acidic oxidizing environments with minimal catalyst leaching. Clicking TEMPO to the phosphonate prior to phosphonate immobilization, rather than after, ensures the clicked catalyst is the only species on the particle surface. This facilitates quantification of the catalyst loading. The stability of the phosphonate linker and simplicity of this catalyst immobilization method make this an attractive approach for tethering catalysts to oxide supports, creating magnetically separable catalysts that can be used under neutral or acidic conditions.
High CO2 Storage Capacity in Alkali‐Promoted Hydrotalcite‐Based Material: In Situ Detection of Reversible Formation of Magnesium Carbonate
Authors: Walspurger Stéphane , Cobden Paul D. , Safonova Olga V. , Wu Yinghai , Anthony Edward J. 
Published: September 2010

AbstractAlkali‐promoted hydrotalcite‐based materials showed very high CO2 storage capacity, exceeding 15 mmol g−1 when the carbonation reaction was carried out at relatively high temperature (300–500 °C) and high partial pressure of steam and CO2. In situ XRD experiments have allowed correlation of high CO2 capacity to the transformation of magnesium oxide centres into magnesium carbonate in alkali‐promoted hydrotalcite‐based material. Moreover, it has been clearly shown that crystalline magnesium carbonate may be reversibly formed at temperatures above 300 °C in the presence of sufficient partial pressure of steam in the gas phase, conditions that are prevalent in pre‐combustion CO2 capture. The role of steam appears to be of utmost importance for the formation of the bulk carbonate phase and for its reversibility. It is proposed that a high partial pressure of steam keeps the magnesium oxide periclase phase sufficiently hydroxylated to allow magnesium carbonate formation if a relatively high partial pressure CO2 is present in the gas phase.
An Autonomous Bio‐barcode DNA Machine for Exponential DNA Amplification and Its Application to the Electrochemical Determination of Adenosine Triphosphate
Authors: Zhang Hui , Fang Congcong , Zhang Shusheng 
Published: September 2010

AbstractA novel autonomous bio‐barcode DNA machine that is driven by template‐dependent DNA replication is developed to exponentially amplify special DNA sequences. Combined with a DNA aptamer recognition element, the DNA machine can be further applied in the aptamer‐based, amplified analysis of small molecules. As a model analyte, adenosine triphosphate (ATP) is determined by using the DNA machine system in combination with a DNA aptamer recognition strategy and differential pulse anodic stripping voltammetry (DPASV). Under the optimum conditions, detection limits as low as 2.8×10−17 M (3σ) for target DNA and 4.7×10−9 M (3σ) for ATP are achieved. The satisfactory determination of ATP in K562 leukemia cell and Ramos Burkitt’s lymphoma cell reveal that this protocol possesses good selectivity and practicality. As a promising biomolecular device, this DNA machine may have an even broader application in the rapidly developing field of nanobiotechnology.