Showing papers in "Journal of Molecular Catalysis in 1980"

TL;DR: Alkyl hydroperoxides in combination with transition metal catalysts (Mo, V, Ti) form a versatile group of reagents for the selective epoxidation of olefins.

TL;DR: In this paper, a general mechanism based on a cyclic peroxymetallation process for the oxidations by peroxo complexes, and a pseudo-cyclic peroxidemetallo-based process was proposed.

TL;DR: In this article, the authors extended the principles of Group V chemistry to tungsten by transferring a neopentylidene ligand from Ta(CHCMe 3 )(PEt 3 ) 2 -Cl 3 to W(O)(OCMe 3 ).

TL;DR: The chemistry of water-soluble tertiary phosphine complexes in aqueous solution appears to be very similar to that of their counterparts in non-aqueous media as mentioned in this paper.

TL;DR: In this article, the performance of Co(II)-Schiff base complexes toward selective oxygenation of organic molecules related to biological systems has been reviewed, and preliminary kinetic studies on the regioselective peroxyquinolato Co(III) complex formation show that the reaction involves a rate-determining hydrogen abstraction from the phenol substrate by a superoxo Co(3) complex initially formed, followed by rapid reduction of the resulting phenoxy radical with Co(2) species leading to the formation of a phenolato co-type complex, to which

TL;DR: In this article, the results of the study of Ni, Pd, and Pt supported catalysts and of catalysts containing Group VIII metals and modifying elements (Sn, Mo, W, Re) are presented.

TL;DR: In this article, the influence of metal content and impregnation technique on struture and metathesis activity for silica supported molybdenum and tungsten oxide is described.

TL;DR: In this paper, metal-carbenes are used to polymerize cycloalkenes to polyalkenamers that are stereoselectively cis, cyclic trisubstituted olefins to polymers that are translationally invariant, and acetylene to polyacetylenes.

TL;DR: In this article, the authors show that silica-supported zirconium hydrides exhibit high activity towards olefin isomerization under mild conditions, such as mild conditions.

TL;DR: In this article, a new rhodium catalyst was applied in the heterogeneous hydroformylation of propylene at 90 °C and 1.57 MPa total pressure.

TL;DR: Iodosylbenzene has been found to react with catalytic amounts of synthetic metalloporphyrinates to give epoxides and alcohols from olefins and alkanes as mentioned in this paper.

TL;DR: In this paper, the dependence of the formation of products and isomers on the phosphine used was studied and it was shown that the formation is directed by a complex combination of steric and electronic factors of the tertiary phosphines.

TL;DR: In this article, the authors studied the performance of p-chlorophenyl methyl sulphide, geraniol, and cyclohexene with hydrogen peroxide in the presence of catalytic amounts of bis acetylacetonato oxovanadium(IV) [VaO(acac)2] in dioxane and dioxANEethanol.

TL;DR: In this article, an insoluble chiral complex of Rh′-aminophosphine supported on inorganic materials was prepared using several mineral clays, which catalyzes the asymmetric hydrogenation of some aminoacid precursors such as α-acetamidoacrylic acid, with good efficiency.

TL;DR: Titanacyclobutenes have been isolated from the reactions of acetylenes with methylenetitanium complexes and their structures have been determined crystallographically as discussed by the authors. But they operate by an alkylidene/metallacycle mechanism like that now generally accepted for conventional olefin metatheses.

TL;DR: In this article, several rhodium, cobalt and platinum/tin complexes were anchored onto a macroreticular sulfonated styrene-divinylbenzene resin in this manner.

TL;DR: The bicyclic dienes are the most reactive monomers examined, they readily copolymerize with cyclopentene and are also polymerized by tungsten hexachloride in the absence of activators or cocatalysts.

TL;DR: In this article, the metathesis of mixtures of 2,8-decadiene and 2.8 decadiene was carried out over a MoO 2 /CoO/Al 2 O 3 catalyst and it was determined that the reaction proceeded by a chain mechanism as described by the Chauvin scheme.

TL;DR: In this article, a spectroscopic study of the adsorption and decomposition of Mo(CO) 6 on a γ-alumina surface is presented, where bridging carbonyl ligands are coordinated to Lewis acid sites on the alumina support.

TL;DR: In this article, an evaluation of various cobalt carbonyl systems as catalyst precursors for CO hydrogenation to methanol, ethanol, n-propanol, and their formates at 180 − 200 °C/200 atm in p-dioxane solution has resulted in the identification of two categories of cobalt complexes: (1) complexes shown spectroscopically to generate HCo(CO)4 under the reaction conditions (e.g.

TL;DR: In this article, a supported liquid phase rhodium catalyst is applied in the heterogeneous hydroformylation of ethylene and propylene, and the activation time of the catalyst is appreciably shortened and the activity and selectivity increased, by previous addition of aldol condensation products or polyethylene glycol to the catalyst solution, or by modification of the silica surface with tri(ethoxyphenylsilane.

TL;DR: In this paper, an intermediate tetracarbonyltungsten-carbene-alkene complex was detected by NMR during the course of the decomposition of 2 to cyclopropane 4.

TL;DR: In this article, the preparation of the complex [PdCl(OH) (bipy), where bipy is 2,2′-bipyridine and can be replaced by a chelating nitrogen-containing ligand, was realized by adding an equivalent of NaOH to the complex.

TL;DR: In this paper, the rate of polymerization of cycloolefins is to a very high degree dependent on the catalyst used and so is the induction period, and the order of the reaction with respect to monomer and catalyst concentration as well as activation energy and entropy have been determined.

TL;DR: The experimental results regarding the metathesis of 4-methyl-2-pentene are not reconcilable with any steric model that predicts stereospecificity with retention of configuration.