bluuebunny/crossref_metadata_2025 huggingface dataset:
Dehydration of tetrahydrofuran by pervaporation using crosslinked PVA/PEI blend membranes
Authors: Rao P. Srinivasa , Sridhar S. , Krishnaiah A.
Published: July 2006

Dense blend membranes were prepared by blending hydrophilic polymers poly(vinyl alcohol) (PVA) and poly(ethyleneimine) (PEI), which were then crosslinked by glutaraldehyde (GA) in a mixture of solvents under the catalysis of hydrochloric acid (HCl) for the dehydration of tetrahydrofuran (THF) by pervaporation. The effect of experimental parameters such as feed water concentration, permeate pressure, and membrane thicknesses on permeate parameters, i.e., flux and selectivity were determined with feed water concentration less than 40 wt %. The membranes were found to have good potential for breaking the azeotrope of 94 wt % THF with a flux of 1.072 and 0.376 kg/m2 h for plane PVA/PEI and crosslinked PVA/PEI blend membrane, which exhibited high selectivity of 156 and 579 respectively. Selectivity was found to improve with decreasing feed water concentration and increasing membrane thickness, whereas flux decreased correspondingly. High permeate pressure causes a reduction in both flux and selectivity. These effects were clearly elucidated with the aid of the known relationship among plasticization effect, degree of swelling, permeate pressure, and feed water concentration. These blend membranes were also subjected to sorption studies to evaluate the extent of interaction and degree of swelling in pure as well as binary feed mixtures. Further ion exchange capacity studies were carried out for all the crosslinked and uncrosslinked membranes to determine the total number of interacting groups present in the membranes. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1152–1161, 2006
Soybean‐ and castor‐oil‐based thermosetting polymers: Mechanical properties
Authors: Can E. , Wool R. P. , Küsefoğlu S.
Published: July 2006

Maleic anhydride modified soybean‐ and castor‐oil‐based monomers, prepared via the malination of the alcoholysis products of the oils with various polyols, such as pentaerythritol, glycerol, and bisphenol A propoxylate, were copolymerized with styrene to give hard rigid plastics. These triglyceride‐based polymers exhibited a wide range of properties depending on their chemical structure. They exhibited flexural moduli in the 0.8–2.5 GPa range, flexural strength in the 32–112 MPa range, glass transition temperatures (Tg) ranging from 72 to 152°C, and surface hardness values in the 77–90 D range. The polymers prepared from castor oil exhibited significantly improved modulus, strength, and Tg values when compared with soybean‐oil‐based polymers. These novel castor and soybean‐oil‐based polymers show comparable properties to those of the high‐performance unsaturated polyester (UP) resins and show promise as an alternative to replace these petroleum‐based materials. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1497–1504, 2006
Blending and white spirit permeation properties of the blends of modified polyamide and ethylene vinyl alcohol with varying vinyl alcohol contents
Authors: Yeh Jen‐Taut , Chen Heng‐Yi , Tsai Fang‐Chang
Published: July 2006

The blending and white spirit permeation properties of the MPAEVOH blends of modified polyamide (MPA) and ethylene vinyl alcohol copolymer (EVOH) were systematically investigated in this study. Three types of EVOHs with varying vinyl alcohol contents were used to prepare the MPAEVOH resins by melt blending them with the MPA resin, respectively. The peak melting temperatures and percentage crystallinity (Wc) values of the EVOH specimens increase significantly as their vinyl alcohol contents increase. The X‐ray diffraction patterns of the melt‐crystallized EVOH crystals transform from monoclinic to orthorhombic lattice as their vinyl alcohol contents are equal to or less than 56 wt %. After blending EVOH in MPA resins, the main melting endotherms and characteristic X‐ray diffraction patterns of both monoclinic and orthorhombic lattices of EVOH crystals originally present in MPAEVOH specimens almost disappear completely, when the weight ratios of MPA to EVOH are equal to or greater than 4. The free‐volume properties and white spirit permeation rates of the EVOH specimens reduce significantly as their vinyl alcohol contents increase. A noticeable “negative deviation” was found on the plots of white spirit permeation rates, annihilation intensity (I3), and/or fractional free‐volume (Fv) versus MPA contents as the MPA contents of each MPAEVOH sample series reach about 80 wt %. Possible reasons accounting for these interesting blending and barrier properties of MPAEVOH specimens are discussed. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1224–1233, 2006
Investigation of free volume, interfacial, and toughening behavior for cyanate ester/bentonite nanocomposites by positron annihilation
Authors: Yu D. H. , Wang B. , Feng Y. , Fang Z. P.
Published: July 2006

Effects of filler on microstructure and toughening behavior of cyanate ester (CE)/bentonite (BT) nanocomposites with different content of BT have been studied by positron annihilation lifetime spectroscopy, X‐ray diffraction, transmission electron microscopy, dynamic mechanical analysis, etc. The interesting results found by PALS indicate that the size and concentration of the free volume holes and the apparent free volume fraction increased with increasing the content of BT, which indicates that adding nano‐layers to thermosetting materials can lead to the high crosslinking density structure “looser.” The experimental results reveal that the increases in size of free volume holes and apparent free volume fraction are related to the increasing conversion of cure reaction. On the other hand, the mechanism of toughening (by adding the nano‐clay to the thermosetting material) has been discussed by combining free volume and interfacial property. It is shown that, for the high crosslinking thermosetting material‐based nanocomposites, both the property of free volume and dispersion state of nano‐layers are the two key factors in determining toughening property. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1509–1515, 2006
Preparation and characterization of cyclic polyesters from ring‐chain reactions of poly(oxyepichlorhydrin oxymaloyl)
Authors: Ferrahi Mohammed Issam , Belbachir Mohammed
Published: July 2006

In this article, the synthesis and characterization of cyclic polyesters of poly(oxyepichlorhydrin oxymaloyl) from a ring‐chain reaction induced by “Maghnite,” an acid‐exchanged montmorillonite as acid solid ecocatalyst (Mag‐H+), is described. Maghnite is already used as catalyst for polymerization of many vinylic and heterocyclic monomers [Belbachir, U.S. Pat. 066969.0101 (2001)]. The reactions were monitored by gel permeation chromatography and 1H‐NMR spectroscopy and the existence of cyclic species was proven. The effect of the amount of catalyst on yield and molecular weight of polymer was studied. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1240–1243, 2006
Preparation and physical properties of films prepared by crosslinking 1,9‐bis(glycidyloxypropyl)pentasiloxanes with α,ω‐bis(3‐aminopropyl)polydimethylsiloxane and their settlement and release properties
Authors: Lee Nam S. , Callow James A. , Callow Maureen E. , Finlay John A. , Weber William P.
Published: July 2006

Six films were prepared by phenol‐catalyzed crosslinking of 1,9‐bis(glycidyloxypropyl)decamethylpentasiloxane (I) or 1,9‐bis[glycidyloxypropyl]‐3,5,7‐tris(3′,3′,3′‐trifluoropropyl)heptamethylpentasiloxane (II) with α,ω‐bis(3‐aminopropyl)‐PDMSs [Mn = 250 (a), 1700 (b), or 3200 (c)]. These films exhibited a wide range of glass transition temperatures (Tgs), high thermal stabilities, hydrophobicities, and fouling‐release properties. Thermal stabilities were measured by thermogravimetric analysis. Surface properties were evaluated by static and dynamic contact angle measurements. Mechanical properties and Tgs were determined by dynamic mechanical thermal analysis. The fouling‐release properties of films Ia–Ic and IIa–IIc toward spores and sporelings (young plants) of the green fouling macroalgae Ulva (syn. Enteromorpha) was also studied. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 751–757, 2006
Molecular weight distribution of polyethylene catalyzed by Ziegler–Natta catalyst supported on MgCl2 doped with AlCl3
Authors: Chen Yong‐Ping , Fan Zhi‐Qiang , Liao Jian‐He , Liao Shuang‐Quan
Published: July 2006

Ti‐based Ziegler–Natta catalysts supported on MgCl2 doped with AlCl3 were prepared by the reaction of MgCl2/AlCl3–ethanol adduct with TiCl4. No AlCl3 crystallites were found in the AlCl3‐doped catalysts by WAXD analysis, suggesting that AlCl3/MgCl2 solid solution was formed. The effect of doping on the catalyst performance in ethylene polymerization was investigated. The results showed that the catalysts based on AlCl3‐doped MgCl2 support exhibited a slightly higher activity than did the MgCl2‐supported catalyst and the molecular weight distribution (MWD) of polyethylene (PE) markedly increased (from 10.8 to 47.9) with the increase of AlCl3 content in catalysts. The changes in catalyst's active center distribution were studied based on nonlinear fitting of the polymer GPC curves by multiple Flory functions. It was found that increase of types of active centers by introducing AlCl3 into the support should be responsible for the broadening of MWD of PE. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1768–1772, 2006
Effects of polyvinylsilicone oil with condensed aromatics on the radiation resistance of heat‐curable silicone rubber
Authors: Jiang Zhigang , Zhang Jie , Feng Shengyu
Published: July 2006

Polyvinylsilicone oil with condensed aromatics (called C1 gum) was synthesized by Diels‐Alder reaction of polyvinylsilicone oil and acenaphthenecyclone, and was used as an additive in heat‐curable silicone rubber. The resistance to irradiation of the silicone rubber obtained was investigated by γ‐rays at doses up to 300, 500, and 1000 kGy in vacuum. The dose rate was 150 kGy/min. After irradiation, the average molecular weight between crosslinks (Mc) and mechanical properties of the silicone rubber were determined. The results show that C1 gum can effectively improve the radiation resistance of silicone rubber. When the amount of C1 gum used in silicone rubber changes from 2 to 14 parts per hundred silicone gum, the radiation protection effects increase with increasing amount of C1 gum. The radiation protection mechanism of C1 gum was also discussed. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1937–1942, 2006
Adhesion of glass/epoxy composites influenced by thermal and cryogenic environments
Authors: Ray Bankim C.
Published: July 2006

Little information regarding the effects of prior thermal and cryogenic conditionings on hydrothermal and mechanical behavior, for varied volume fractions of constituent phases in polymer matrix fiber composites, has been published to date. The present experimental investigation uses flexural test to assess the effects of thermal and cryogenic treatments, and concurrently followed hydrothermal aging on quality of adhesion of multilayered laminates for 55, 60, and 65 wt % of E‐glass fiber‐reinforced epoxy composites. The specimens were conditioned at 80°C and −80°C temperatures for different time durations, and thereafter they were immediately immersed in boiling water for an hour. Water absorption rates were evaluated for those conditioned specimens in such environment. Absorption study in hydrothermal aging showed a remarkable variation for the two cases of prior conditionings. The shear strength values were compared with the test value of as‐cured samples. Degradation of mechanical property was found to be less prevalent during hydrothermal aging, with a prior conditioning at 80°C temperature compared to −80°C treated glass/epoxy composites. Improved shear strength for almost all conditions of thermal conditioning in the initial stages has highlighted better adhesion influenced by postcuring phenomena during thermal or cryogenic conditioning. It was also observed from water absorption data that high temperature conditioning contributed more strengthening effect and better adhesion at the interfaces. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1943–1949, 2006
Stiffening agent for cotton woven fabrics made from methacrylic acid vinyl acetate methylacrylate terpolymer
Authors: Moustafa A. F.
Published: July 2006

The emulsion polymerizations of methacrylic acid (MAA), vinyl acetate (VAc), and methyl acrylate (MA) in different VAc/MA molar concentrations (X1, 0.232/0.813; X2, 0.348/0.697; X3, 0.456/0.581; X4, 0.581/0.465; X5, 0.697/0.348) and fixed MAA concentration (0.116 mol) were carried out using sodium dodecyl sulfate (SDS; 34 mmol) as emulsifier and potassium persulphate (K2S2O8; 37 mmol) as initiator at 70 °C for 6 h in semicontinuous reaction mode. The average molecular weights (Mn,Mw) and the molecular weights distributions were determined using gel permeation chromatography (GPC). All terpolymers prepared showed monomodal molecular weights distributions. Glass transition (Tg), crystallization (Tc), and melting (Tm) temperatures and thermal stability of the prepared terpolymers were determined using differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA), respectively. The elongation percentage at rupture, tensile strength and accelerated thermal aging were determined for X1–5terpolymers, as functions of the molar composition in the emulsion polymerization feed. The terpolymers prepared, X1–5terpolymers, were tested as stiffening agents for cotton woven fabrics through crosslinking to cellulose, using sodium hypophosphite monohydrate (NaH2PO2·H2O) as catalyst. The effect of X1–5compositions upon the stiffening efficiency was discussed. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 2006
Melting aspects of filled compounds in a modular co‐rotating twin screw extruder
Authors: Jung Hochul , White James L.
Published: July 2006

In the polymer industry, precompounded materials are widely used. Carefully designed melting experiments were carried out to investigate melting mechanisms in master batched polymer compounds, using an intermeshing co‐rotating twin screw extruder. Calcium carbonate or aluminum powder was master batched with linear low‐density polyethylene (LLDPE). The calcium carbonates, which were used in the compounds, have differences in weight fraction and particle size. The compounds containing filler have higher thermal conductivities and viscosities than neat polyethylene. We observed melting initiation and propagation mechanisms of LLDPE compounds by removal and characterization of polymer compound carcasses in the melting region. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1990–2012, 2006
Performance of pineapple leaf fiber–natural rubber composites: The effect of fiber surface treatments
Authors: Lopattananon Natinee , Panawarangkul Kuljanee , Sahakaro Kannika , Ellis Bryan
Published: July 2006

Composites of natural rubber (NR) and short pineapple leaf fiber (PALF) were prepared on a laboratory two‐roll mill. The influences of untreated fiber content and orientation on the processing and mechanical properties of the composites were investigated. The dependence of extent of orientation on fiber concentration was also established. Sodium hydroxide (NaOH) solutions (1, 3, 5, and 7% w/v) and benzoyl peroxide (BPO) (1, 3, and 5 wt % of fiber) were used to treat the surfaces of PALFs. FTIR and scanning electron microscope (SEM) observations were made of the treatments in terms of chemical composition and surface structure. The tensile strength and elongation at break of the composites were later studied. The fiber–matrix adhesion was also investigated using SEM technique. It was found that all surface modifications enhanced adhesion and tensile properties. The treatments with 5% NaOH and 1% BPO provided the best improvement of composite strength (28 and 57% respectively) when compared with that of untreated fiber. The PALF‐NR composites also exhibited better resistance to aging than its gum vulcanizate, especially when combined with the treated fibers. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1974–1984, 2006
Studies on the diffusion characteristics of some aromatic solvents into polypropylene film
Authors: Igwe Isaac O. , Ewulonu Chinomso M. , Igboanugo Ifeoma
Published: July 2006

The sorption properties of the solvents benzene, toluene, and xylene into polypropylene films at 40, 60, and 80°C have been investigated. The diffusivity and permeability of the solvents into polypropylene films were found to increase in the order of solvent, benzene, toluene, and xylene at the different temperatures studied. The properties were also found to be temperature dependent. The zsolubility of the solvents into polypropylene films was found to be highest in toluene, followed by xylene, and least in benzene. However, a general increase in solubility with temperature was observed for all the solvents studied. The calculated values of activation energy of diffusion did not show any relationship with solvent properties. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1985–1989, 2006
Oxidative status and serum leptin levels in obese prepubertal children
Authors: Ustundag Bilal , Gungor Serdal , Aygün A. Denizmen , Turgut Mehmet , Yilmaz Erdal
Published: July 2006

The prevalence of obesity in children has increased dramatically over the last 20–30 years in developed countries. The aim of this study was to evaluate the oxidative and antioxidant status and any correlation with leptin in obese prepubertal children. A cross‐sectional study was made of healthy children from ten elementary schools in the province of Elazig, Eastern Turkey. Blood samples were drawn from children comprising obese and control groups, on a visit to their school in the morning after an overnight fast. The mean body mass index (BMI) was 24.03 ± 4.09 kg/m2in the obese group and was 17.51 ± 2.33 kg/m2in the control group. Mean plasma leptin concentration was significantly higher in the obese children. Homocysteine and malondialdehyde (MDA) levels were also significantly higher in the obese group. In contrast superoxide dismutase (SOD) and glutathione peroxidase activities were significantly decreased in the obese group (p < 0.001). In conclusion, in prepubertal obese children oxidative stress was increased and MDA and homocysteine levels were well correlated with serum leptin level and BMI. In contrast with the increase in oxidative stress, antioxidant activities of SOD and glutathione peroxidase were decreased in obese prepubertal children. Copyright © 2006 John Wiley & Sons, Ltd.
A Range of Spin‐Crossover Temperature T1/2>300 K Results from Out‐of‐Sphere Anion Exchange in a Series of Ferrous Materials Based on the 4‐(4‐Imidazolylmethyl)‐2‐(2‐imidazolylmethyl)imidazole (trim) Ligand, [Fe(trim)2]X2 (X=F, Cl, Br, I): Comparison of Experimental Results with Those Derived from Density Functional Theory Calculations
Authors: Lemercier Gilles , Bréfuel Nicolas , Shova Sergiu , Wolny Juliusz A. , Dahan Françoise , Verelst Marc , Paulsen Hauke , Trautwein Alfred X. , Tuchagues Jean‐Pierre
Published: July 2006

The synthesis and characterization of [FeII(trim)2]Cl2 (2), [FeII(trim)2]Br2⋅MeOH (3), and [FeII(trim)2]I2⋅MeOH (4), including the X‐ray crystal structure determinations of 2 (50 and 293 K) and 4 (293 K), have been performed and their properties have been examined. In agreement with the magnetic susceptibility results, the Mössbauer data show the presence of high‐spin (HS) to low‐spin (LS) crossover with a range of T1/2 larger than 300 K (from ≈20 K for [FeII(trim)2]F2 (1) to ≈380 K for 4). All complexes in this series include the same [Fe(trim)2]2+ complex cation: the ligand field comprises a constant contribution from the trim ligands and a variable one originating from the out‐of‐sphere anions, which is transmitted to the metal center by the connecting imidazole rings and hydrogen bonds. The impressive variation in the intrinsic characteristics of the spin‐crossover (SCO) phenomenon in this series is then interpreted as an inductive effect of the anions transmitted to the nitrogen donors through the hydrogen bonds. Based on this qualitative analysis, an increased inductive effect of the out‐of‐sphere anion corresponds to a decreased SCO temperature T1/2, in agreement with the experimental results. Electronic structure calculations with periodic boundary conditions have been performed that show the importance of intermolecular effects in tuning the ligand field, and thus in determining the transition temperature. Starting with the geometries obtained from the X‐ray studies, the [FeII(trim)2]X2 complex molecules 1–4 have been investigated both for the single molecules and the crystal lattices with the local density approximation of density functional theory. The bulk geometries of the complex cations deduced from the X‐ray studies and those calculated are in fair agreement for both approaches. However, the trend observed for the transition temperatures of 1–4 disagrees with the trend for the spin‐state splittings ES (difference EHS−ELS between the energy of the HS and LS isomers) calculated for the isolated molecules, whereas it agrees with the trend for ES calculated with periodic boundary conditions. The latter calculations predict the strongest stabilization of the HS state for the fluoride complex, which actually is essentially HS above T=50 K, while the most pronounced stabilization of the LS state is predicted for 4, in line with the experimental results.
Identity SN2 Reactions X−+CH3X→XCH3+X− (X=F, Cl, Br, and I) in Vacuum and in Aqueous Solution: A Valence Bond Study
Authors: Song Lingchun , Wu Wei , Hiberty Philippe C. , Shaik Sason
Published: July 2006

The recently developed (L. Song, W. Wu, Q. Zhang, S. Shaik, J. Phys. Chem. A 2004, 108, 6017) valence bond method coupled with a polarized continuum model (VBPCM) has been applied to the identity SN2 reaction of halides in the gas phase and in aqueous solution. The barriers computed at the level of the breathing orbital VB method (P. C. Hiberty, J. P. Flament, E. Noizet, Chem. Phys. Lett. 1992, 189, 259), BOVB and VBPCM//BOVB, are comparable to CCSD(T) and CCSD(T)//PCM results and to experimentally derived barriers in solution (W. J. Albery, M. M. Kreevoy, Adv. Phys. Org. Chem. 1978, 16, 85). The reactivity parameters needed to apply the valence bond state correlation diagram (VBSCD) method (S. Shaik, J. Am. Chem. Soc. 1984, 106, 1227), were also determined by VB calculations. It has been shown that the reactivity parameters along with their semiempirical derivations provide a satisfactory qualitative and quantitative account of the barriers.
Self‐Assembly and Liquid‐Crystalline Properties of 5‐Fluoroalkylporphyrins
Authors: Jin Li‐Mei , Yin Juan‐Juan , Chen Liang , Zhou Jin‐Ming , Xiao Ji‐Chang , Guo Can‐Cheng , Chen Qing‐Yun
Published: July 2006

We report three crystal structures of a synthetic 5‐fluoroalkylporphyrin molecule that was programmed for self‐assembly. All the X‐ray structures of zincated and free‐base porphyrins Zn2 b, Zn5 a, and 2 b revealed rigorous π–π stacking and extremely hydrophobic interactions. Other the other hand, the strong aggregation of 5‐fluoroalkylporphyrins in solution was also found. Interestingly, the regular nanopore formation of the 5‐fluoroalkylporphyrin was visualized by atomic force microscopy (AFM). Importantly, the 5‐fluoroalkylporphyrins possess liquid‐crystalline properties that were confirmed by using a combination of differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) techniques. By comparison, the self‐assembly of non‐fluorine‐containing porphyrins with similar structure showed much lower aggregation ability, as investigated by NMR techniques. Additionally, no birefringent mesophase was observed for the non‐fluorine‐containing porphyrin.
Structure and Reactivity of Radical Ions: New Twists on Old Concepts
Authors: Donoghue Patrick J. , Wiest Olaf
Published: July 2006

Electron transfer is the simplest reaction possible, yet it has a profound impact on the structure and reactivity of organic compounds. These changes allow a new look at some of the fundamental concepts that are used to explain organic chemistry, such as symmetry, aromaticity, and bonding. The results from high‐level electronic structure calculations are used to analyze the mechanistic differences in the pericyclic reactions of simple hydrocarbons and their radical cation counterparts. The importance of state symmetry correlation, Jahn–Teller distortions, delocalization, and fractional bonding for the reaction pathways of hydrocarbon radical cations is discussed.
A Synthetic Breakthrough into an Unanticipated Stability Regime: A Series of Isolable Complexes in which C6, C8, C10, C12, C16, C20, C24, and C28 Polyynediyl Chains Span Two Platinum Atoms
Authors: Zheng Qinglin , Bohling James C. , Peters Thomas B. , Frisch Anja C. , Hampel Frank , Gladysz J. A.
Published: July 2006

The reaction of trans‐[PtCl(p‐tol){P(p‐tol)3}2] (PtCl) and H(CC)2H (cat. CuI, HNEt2) gives PtC4H (82 %), which can be cross‐coupled with excess HCCSiEt3 (acetone, O2, CuCl/TMEDA; Hay conditions) to yield PtC6Si (77 %). The addition of nBu4N+F− in wet acetone gives PtC6H (84 %), and further addition of ClSiMe3 (F− scavenger) and excess HCCSiEt3 (Hay conditions) yields PtC8Si (23 %). Similar cross‐coupling reactions of PtCxH (generated in situ for x>6) and excess H(CC)2SiEt3 give a) x=4, PtC8Si (29 %), PtC12Si (30 %), and PtC16Si (1 %); b) x=6, PtC10Si (59 %) and PtC14Si (7 %); c) x=8, PtC12Si (42 %); and d) x=10, PtC14Si (20 %). Hay homocoupling reactions of PtC4H, PtC6H, PtC8H, and PtC10H give PtC8Pt, PtC12Pt, PtC16Pt, and PtC20Pt (88–70 %), but PtC12H decomposes too rapidly. However, when PtC12Si and PtC14Si are subjected to Hay conditions, protodesilylation occurs in the presence of the oxidizing agent and PtC24Pt (36 %) and PtC28Pt (51 %) are isolated. Reactions of PtC6H and PtC10H with PtCl (CuI, HNEt2) give PtC6Pt (56 %) and PtC10Pt (84 %). The effect of the chain lengths in PtCxPt upon thermal stabilities (>200 °C for x≤20), IR νCC patterns (progressively more bands), colors (yellow to orange to deep red), UV/Vis spectra (progressively red‐shifted and more intense bands with ε>400 000 M−1 cm−1), redox properties (progressively more difficult oxidations), and NMR spectra (many monotonic trends) are analyzed, including implications for the sp carbon allotrope carbyne. Whereas all other dodecaynes and tetradecaynes rapidly decompose at room temperature, PtC24Pt and PtC28Pt remain stable at >140 °C. Crystal structures of PtCxSi (x=6, 8, 10) and PtCxPt (x=6, 8, 10, 12) have been determined.
Revising the Highest Oxidation States of the 5d Elements: The Case of Iridium(+VII)
Authors: Riedel Sebastian , Kaupp Martin
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Single Crystal Structure and Raman Spectrum of Ba3Na2(CN2)4.
Authors: Dong Yongkwan , DiSalvo Francis J.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Er5Ni3Al3Ge4: A Quaternary Variant of the NbCoB Type.
Authors: Demchenko Pavlo , Konczyk Joanna , Demchenko Grigorii , Gladyshevskii Roman , Pavlyuk Volodymyr
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Sr2Cu2TeO6Br2: Honeycomb Layers of Copper(II) Ions.
Authors: Takagi Rie , Johnsson Mats
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Chemical Stability of LiNaSO4 Electrolyte During Operation in a H2—O2 Fuel Cell.
Authors: Feng Yu , Luo Jingli , Chuang Karl T.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Zirconium Scandium Oxide Nitrides: Formation and Decomposition Followed in situ by XRD and Thermal Analysis.
Authors: Martinez Meta N. J. , Schweda E.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Syntheses and Crystal Structures of Three New Borates Templated by Transition‐Metal Complexes in situ.
Authors: Wang Guo‐Ming , Sun Yan‐Qiong , Yang Guo‐Yu
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Enantioselective Modular Synthesis of 2,4‐Disubstituted Cyclopentenones by Iridium‐Catalyzed Allylic Alkylation.
Authors: Schelwies Mathias , Duebon Pierre , Helmchen Guenther
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Remote Stereocontrol Using (E)‐6‐Hydroxy‐4‐methylhex‐2‐enyl(tri‐n‐butyl)stannane.
Authors: MacCormick Somhairle , Thomas Eric J.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Very Simple, Highly Stereoselective and Modular Synthesis of Ferrocene‐Based P‐Chiral Phosphine Ligands.
Authors: Chen Weiping , Mbafor William , Roberts Stanley M. , Whittall John
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Resolution of Racemic 2‐Aminocyclohexanol Derivatives and Their Application as Ligands in Asymmetric Catalysis.
Authors: Schiffers Ingo , Rantanen Toni , Schmidt Frank , Bergmans Werner , Zani Lorenzo , Bolm Carsten
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Highly Enantioselective Addition of Ketones to Nitroolefins Catalyzed by New Thiourea—Amine Bifunctional Organocatalysts.
Authors: Tsogoeva Svetlana B. , Wei Shengwei
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
New Indium‐Mediated Cyclization Reactions of Tethered Haloenynes in Aqueous Solvent Systems.
Authors: Goeta Andres , Salter Matthew M. , Shah Hummad
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Palladium‐Catalyzed Tandem Cyclization—Anion Capture Processes. Part 8. In situ and Preformed Organostannanes. Carbamyl Chlorides and Other Starter Species.
Authors: Anwar Usman , Fielding Mark R. , Grigg Ronald , Sridharan Visuvanathar , Urch Christopher J.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Bromoiodinanes with an I(III)—Br Bond: Preparation, X‐Ray Crystallography and Reactivity as Electrophilic Brominating Agents.
Authors: Braddock D. Christopher , Cansell Gemma , Hermitage Stephen A. , White Andrew J. P.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Ionic Liquid Promoted Synthesis of β‐Enamino Ketones at Room Temperature.
Authors: Bhosale Rajesh S. , Suryawanshi Padmakar A. , Ingle Sachin A. , Lokhande Mahendra N. , More Sandeep P. , Mane Sandeep B. , Bhosale Sidthanath V. , Pawar Rajendra P.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of 1‐Aryl‐4‐azolylbutanones.
Authors: Karachev D. A. , Popkov S. V.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Ruthenium Metathesis Catalysts Containing Chelating Aryloxide Ligands.
Authors: Monfette Sebastien , Fogg Deryn E.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
An Efficient Procedure for the Synthesis of 1,1‐Diacetates from Aldehydes with Acetic Anhydride Catalyzed by Silica Sulfate.
Authors: Jin Tong‐Shou , Zhao Ying , Gu Shu‐Qing , Liu Li‐Bin , Li Tong‐Shuang
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Iron Nanoparticles in the Coupling of Alkyl Halides with Aryl Grignard Reagents.
Authors: Bedford Robin B. , Betham Michael , Bruce Duncan W. , Davis Sean A. , Frost Robert M. , Hird Michael
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Preparation of Trifluoromethylated Ynamines and Their Reactions with Some Electrophilic Reagents.
Authors: Ishihara Takashi , Mantani Toshiya , Konno Tsutomu , Yamanaka Hiroki
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Solid‐Phase Self‐Organized Catalyst of Nanopalladium with Main‐Chain Viologen Polymers: α‐Alkylation of Ketones with Primary Alcohols.
Authors: Yamada Yoichi M. A. , Uozumi Yasuhiro
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Highly Enantioselective Monoalkylation of p‐Chlorobenzaldehyde Imine of Glycine tert‐Butyl Ester under Mild Phase‐Transfer Conditions.
Authors: Ooi Takashi , Arimura Yuichiro , Hiraiwa Yukihiro , Yuan Lin Ming , Kano Taichi , Inoue Toru , Matsumoto Jun , Maruoka Keiji
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Electrocatalytic Transformation of Dialkyl Malonates and Arylidene‐ or Alkylidenemalononitriles into Dialkyl Esters of 3‐Substituted 2,2‐Dicyanocyclopropane‐1,1‐dicarboxylic Acids.
Authors: Elinson M. N. , Feducovich S. K. , Zaimovskaya T. A. , Vereshchagin A. N. , Gorbunov S. V. , Nikishin G. I.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Ruthenium‐Catalyzed [2 + 2] Cycloadditions of Bicyclic Alkenes and Ynamides.
Authors: Villeneuve Karine , Riddell Nicole , Tam William
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Palladium‐Catalyzed Cross‐Coupling Reaction of Triorganoindium Reagents with Propargylic Esters.
Authors: Riveiros Ricardo , Rodriguez David , Perez Sestelo Jose , Sarandeses Luis A.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
The First Palladium‐Catalyzed Sonogashira Coupling of Unactivated Secondary Alkyl Bromides.
Authors: Altenhoff Gereon , Wuertz Sebastian , Glorius Frank
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Preparation of Primary Arylamines via Arylzinc Chlorides in Good Yields.
Authors: Daskapan Tahir
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
SnCl2‐Mediated Efficient N,N‐Dialkylation of Azides to Tertiary‐Amine via Potential Stannaimine Intermediate.
Authors: Roy Ujjal Kanti , Roy Sujit
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Hydrogenation of Isophthalonitrile with 1‐Methylimidazole as an Effective Solvent for m‐Xylenediamine Production.
Authors: Chae Tae Young , Row Sung Wook , Yoo Kye Sang , Lee Sang Duek , Lee Do Weon
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Direct Conversion of Aryl Halides to Phenols Using High‐Temperature or Near‐Critical Water and Microwave Heating.
Authors: Kormos Chad M. , Leadbeater Nicholas E.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Enantioselective Catalytic Allylation of Arylmethylketones Using Tetraallyltin and Tin(IV) Chloride Mixtures.
Authors: Prieto Oscar , Woodward Simon
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of β‐Amino Alcohols by Regioselective Ring Opening of Epoxides with Aromatic Amines Catalyzed by Tin(II) Chloride.
Authors: Alam M. Mujahid , Varala Ravi , Enugala Ramu , Adapa Srinivas R.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Efficient and Rapid Method for the Oxidation of Electron‐Rich Aromatic Aldehydes to Carboxylic Acids Using Improved Basic Hydrogen Peroxide.
Authors: Cong Zhi‐Qi , Wang Chun‐Ian , Chen Tie , Yin Bing‐Zhu
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Hydroacylation of Activated Ketones Catalyzed by N‐Heterocyclic Carbenes.
Authors: Chan Audrey , Scheidt Karl A.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of Nickel‐Salicylideneimines Complexes and Catalyzing Cross‐Coupling Reaction of Aryl Halides and Grignard Reagents.
Authors: Zhao Jing‐Wei , Song Li‐Ping , Wang Yong‐Kang , Zhu Shi‐Zheng
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Direct Synthesis of Methyl 2‐Diazo‐4‐aryl‐3‐butenoates and Their Application to the Enantioselective Synthesis of 4‐Aryl‐4‐(1‐naphthyl)‐2‐butenoates.
Authors: Davies Huw M. L. , Yang Jaemoon , Manning James R.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of Aminomethylazetidines Regioselective Reactions of Mesyloxymethylazetidinones with Nucleophiles. Part 2.
Authors: Boros Eva , Bertha Ferenc , Czira Gabor , Feller Antal , Fetter Jozsef , Kajtar‐Peredy Maria , Simig Gyula
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis and Some Transformations of 4‐Alkoxymethyl‐2‐ethoxycarbonyl‐2‐ethoxycarbonylmethylbutanolides.
Authors: Kochikyan T. V. , Samvelyan M. A. , Harutyunyan V. S. , Avetisyan A. A.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Enantioselective Intramolecular Cyclopropanation of cis‐Alkenes by Chiral Ruthenium(II) Schiff Base Catalysts and Crystal Structures of (Schiff Base)Ruthenium Complexes Containing Carbene, PPh3, and CO Ligands.
Authors: Li Gong‐Yong , Zhang Jing , Chan Philip Wai Hong , Xu Zhen‐Jiang , Zhu Nianyong , Che Chi‐Ming
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
The Bsmoc Group as a Novel Scaffold for the Design of Irreversible Inhibitors of Cysteine Proteases.
Authors: Iley Jim , Moreira Rui , Martins Luisa , Guedes Rita C. , Soares Claudio M.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Room Temperature Palladium‐Catalyzed Intramolecular Hydroamination of Unactivated Alkenes.
Authors: Michael Forrest E. , Cochran Brian M.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Interaction of N,N‐Dimethylhydrazonomethyl and α‐Hydroxyketone Groups in Hetaryl Analogues of Unsymmetrical Benzoins.
Authors: Ivonin S. P. , Lapandin A. V. , Shtamburg V. G.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Solvent‐Free Heck—Jeffery Reactions under Ball‐Milling Conditions Applied to the Synthesis Unnatural Amino Acids Precursors and Indoles.
Authors: Tullberg Erik , Schacher Felix , Peters Dan , Frejd Torbjoern
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Gold(III) Chloride Promoted Addition of Electron‐Rich Heteroaromatic Compounds to the C=C and C=O Bonds of Enals.
Authors: Nair Vijay , Vidya N. , Abhilash K. G.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Efficient Synthesis of Indoles Using [3,3]‐Sigmatropic Rearrangement of N‐Trifluoroacetyl Enehydrazines.
Authors: Miyata Okiko , Takeda Norihiko , Kimura Yasuo , Takemoto Yoshiji , Tohnai Norimitsu , Miyata Mikiji , Naito Takeaki
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Unexpected 7‐Methylation of Oxindoles.
Authors: Volk Balazs , Kapiller‐Dezsoefi Rita , Simig Gyula
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of 4H‐[1,3]Dithiolo[4,5‐b]pyrroles Through the Reaction of Benzoyl Isothiocyanate and Dialkyl Acetylenedicarboxylates in the Presence of Ph3P.
Authors: Yavari Issa , Djahaniani Hoorieh
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
3‐Aryl‐ and 2,3‐Diaryl‐4‐oxo‐4,5,6,7‐tetrahydroindazoles. Part 1. Reactions of Phenyl‐ and Tosylhydrazones of Dimedone and Cyclohexane‐1,3‐dione with Substituted Benzaldehydes.
Authors: Strakova I. , Strakovs A. , Petrova M.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
4,5‐Dioxo‐ and 4‐Oxo‐2,3‐diaryl‐5‐diazo‐6,6‐dimethyl‐4,5,6,7‐tetrahydroindazoles
Authors: Strakova I. , Strakovs A. , Petrova M.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Synthesis of 5‐Arylidene‐3‐(4′‐bromobenzyl)thiazolidine‐2,4‐diones.
Authors: Popov‐Pergal K. , Pergal M. , Csanadi J. , Djokovic D.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A Convenient Synthesis of Functionalized N‐(Ethynyl)benzotriazoles (V).
Authors: Katritzky Alan R. , Singh Sandeep K. , Jiang Rong
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Microwave‐Assisted Efficient, One‐Pot, Three‐Component Synthesis of 3,5‐Disubstituted 1,2,4‐Oxadiazoles under Solvent‐Free Conditions.
Authors: Adib Mehdi , Jahromi Amin Haghighat , Tavoosi Narjes , Mahdavi Mohammad , Bijanzadeh Hamid Reza
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Xanthene Derivatives and ortho‐Substituted Phenols — Products from Dehydrogenation of Acyclic 1,5‐Diketones.
Authors: Akimova T. I. , Kaminsky V. A. , Svistunova I. V.
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
An Efficient Oxidation of 1,4‐Dihydropyridines to Pyridines Using Silver Carbonate on Silica Gel and Celite.
Authors: Momeni Ahmad Reza , Sameh Tayebeh , Golmohammadi Hosein , Naghash Hamid Javaherian , Aliyan Hamid , Massah Ahmad Reza , Solati Shirin
Published: July 2006

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.