Asymmetric catalysis with chiral organocopper-copper arenethiolates
Abstract
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Structure-Property Relationships of Wood Fiber-Filled Polypropylene Composite
The effects of the addition of interface modifiers on the structure and properties of wood fiber-filled polypropylene (PP) have been studied. Although an increase in the wood fiber loading reduces the overall cost of composites, the mechanical properties of such composites are very poor in the absence of a suitable in…
Heterogeneous Baeyer–Villiger oxidation of ketones using an oxidant consisting of molecular oxygen and aldehydes in the presence of hydrotalcite catalysts
Hydrotalcites catalyse Baeyer–Villiger oxidation of ketones using a combination oxidant system of molecular oxygen and benzaldehyde to give high yields of lactones and esters at 40 °C.
Hydrothermal synthesis of perovskite materials: Thermodynamic modeling and experimental verification
A comprehensive thermodynamic model of hydrothermal reactions has been developed to predict the optimum conditions for synthesizing perovskite ferroelectric compounds. The model indicates the ranges of reagent concentrations, pH and temperature for which the desired product can be synthesized with the highest possible…
Ammonium acetate as a very simple and efficient cocatalyst for manganese porphyrin-catalysed oxygenation of hydrocarbons by hydrogen peroxide
A one-phase system using chloro[tetra(2,6-dichlorophenyl)porphyrinato]manganese(III) catalyst and ammonium acetate cocatalyst epoxidised alkenes by H2O2 with complete conversion in excellent yield and hydroxylated alkanes with yields of 45–87%; for most reactions this system gave better results than a previously descr…
Strengthening polymer interfaces
Interfaces between immiscible glassy homopolymers are normally weak as there are few chains which can penetrate far enough into the opposite side of the interface to become entangled there. To overcome this problem a number of strategies for strengthening can be pursued, all of which involve adding a third polymeric c…
Similarities between protein 3-D structures
A simple, new, systematic method has been developed to evaluate the structural similarity of proteins. Firstly, similar protein fragments of a definable length are detected, combined in pairs and superimposed. The fits are improved until a maximum number of C alpha atoms show a distance below a given threshold value.…
Lyotropic and thermotropic mesophase formation of novel tetra[oligo(ethyleneoxy)]-substituted phthalocyanines
The synthesis of tetra[oligo(ethyleneoxy)]phthalocyanines is described. Preliminary characterization of both thermotropic and lyotropic mesophases obtained from examples of this series are reported.
Viscoelastic properties of poly(styrene-co-acrylate) and poly(vinylcyclohexane-co-acrylate) ionomers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of poly(styrene-co-acrylate) and poly(vinylcyclohexane-co-acrylate) ionomersJoon Seop Kim, Gaoming Wu, and Adi EisenbergCite this: Macromolecules 1994, 27, 3, 814–824Publication Date (Print):January 1, 1994Publication History Published online1 May 200…
Synthesis of Pyrroles from Benzyl Isocyanoacetate
All articles of this category Benzyl esters of 5-unsubstituted pyrrole-2-carboxylic acids were prepared in excellent yields by the base-catalyzed condensation of benzyl isocyanoacetate with α-acetoxynitro compounds, or nitroalkenes,in refluxing tetrahydrofuran. These pyrrolic products are important intermediates in th…
Synthesis and remarkable properties of iron β-polynitroporphyrins as catalysts for monooxygenation reactions
Two new porphyrins bearing several electron-withdrawing β-substituents were obtained in one step, in yields of about 50%, by nitration of meso-tetra(2,6-dichlorophenyl)porphyrin (TDCPPH2) and meso-tetrapentafluorophenylporphyrin (TFPPH2) with HNO3; the iron(III) complex of β-hexanitro-TDCPPH2 was a remarkable catalyst…
Synthesis, crystal structure and non-linear optical properties of [NEt4]4[Cu6Mo2S6O2Br2I4]
The reaction of [NH4]2[MoO2S2], Cul and NEt4Br in the solid state produced [NEt4]4[Cu6Mo2S6O2Br2I4]. Single-crystal X-ray analysis reveals that the cluster anion consists of two nest-shaped fragments interconnected through a Cul2Cu bridge with Cu–I and Cu ⋯ I bond lengths of 2.502 and 2.972 Å respectively. The cluster…
Ultrahigh Strength of Rapidly Solidified Al<SUB>96−<I>x</I></SUB>Cr<SUB>3</SUB>Ce<SUB>1</SUB>Co<I><SUB>x</SUB></I> (<I>x</I>=1, 1.5 and 2%) Alloys Containing an Icosahedral Phase as a Main Component
An extremely high tensile strength (σf) of 1340 MPa combined with good bending ductility was obtained as a mixed structure consisting of nanoscale icosahedral (I) particles with a size of about 40 nm surrounded by a thin fcc-Al layer with a thickness of about 2 nm in rapidly solidified Al99−x−yCrxCe1Coy alloys contain…
Efficient H2O2 oxidation of chlorinated phenols catalysed by supported iron phthalocyanines
Amberlite-supported iron and manganese sulfonated phthalocyanines are efficient catalysts for the oxidation of chlorinated phenols by H2O2; these support catalysts can be recycled several times without important loss of catalytic activity.
NiAl underlayers for CoCrTa magnetic thin films
CoCrTa films were sputter-deposited on either NiAl or Cr underlayers on glass substrates and their coercivities were compared. The NiAl film was found have the B2 structure with a lattice parameter of /spl sim/0.288 nm. The grain size of a 100 nm NiAl film is /spl sim/15 nm, which is about 50% smaller than a similarly…
Hydrogen binding to and fluxional behavior of Ir(H)2X(P-tert-Bu2R)2 (X = Cl, Br, I; R = Me, Ph)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen binding to and fluxional behavior of Ir(H)2X(P-tert-Bu2R)2 (X = Cl, Br, I; R = Me, Ph)Bryan E. Hauger, Dmitry Gusev, and Kenneth G. CaultonCite this: J. Am. Chem. Soc. 1994, 116, 1, 208–214Publication Date (Print):January 1, 1994Publication History Published online1…
Control of pore size of porous silica by means of pyrolysis of an organic–inorganic polymer hybrid
Pyrolysis of a silica gel hybrid with a starburst dendrimer gives porous silica, in which the pore-size is successfully controlled by the size of the organic component used.
A protein activator of Ca(2+)-calmodulin-dependent protein kinase Ia.
A protein activator of Ca(2+)-calmodulin-dependent protein kinase Ia (CaM kinase Ia) was purified to near homogeneity from pig brain. In the final step of purification, sucrose density gradient centrifugation, CaM kinase Ia activating activity correlated with the presence of a approximately 52-kDa protein band detecte…
Relevance of sequence statistics for the properties of extremophilic proteins
The amino acid composition of proteins from mesophilic and extremophilic organisms is commonly assumed to reflect the mechanisms of molecular adaptation to extremes of physical conditions. In this context, halophilic behaviour has been attributed to significantly increased numbers of aspartic and glutamic acid residue…
14N NMR study of surfactant mesophases in the synthesis of mesoporous silicates
Surfactant mesophase formation during the synthesis of M41S, the mesoporous material, has been studied using 14N nuclear magnetic resonance spectroscopy. Siliceous gels producing M41S materials displaying hexagonal and lamellar powder X-ray diffraction patterns have been observed to contain hexagonal mesophases which…