Showing papers on "Palladium published in 1973"
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01 Jan 1973
347 citations
340 citations
TL;DR: Arylation of propylene, ethylene, styrene, and methyl acrylate with iodobenzene was found to be catalyzed by metallic palladium in methanol to give methylstyrene and methyl cinnamate, respectively as discussed by the authors.
Abstract: Arylation of propylene, ethylene, styrene, and methyl acrylate with iodobenzene was found to be catalyzed by metallic palladium in methanol to give methylstyrene, styrene, t-stilbene, and methyl cinnamate, respectively. Their yields and selectivities increased significantly by the addition of excess potassium acetate as an acceptor of hydriodic acid formed. The course of catalytic reaction is discussed in terms of the oxidative addition of iodobenzene to a palladium complex of low oxidation state.
113 citations
112 citations
TL;DR: In the presence of Pd(II) salts, substitution reaction of aryl halides with potassium cyanide occurs readily which affords a simple and beneficial method for aryL cyanide synthesis.
Abstract: In the presence of Pd(II) salts, substitution reaction of aryl halides with potassium cyanide occurs readily which affords a simple and beneficial method for aryl cyanide synthesis.
106 citations
103 citations
101 citations
TL;DR: In this article, the reactions of various palladium(II) and platinum (II) species with a number of ligands which may function as electron pair donors while simultaneously forming metal-carbon σ-bonds have been examined.
Abstract: The reactions of various palladium(II) and platinum(II) species with a number of ligands which may function as electron pair donors while simultaneously forming metal–carbon σ-bonds have been examined. Compounds containing metal–carbon σ-bonds have been obtained for NN-2-trimethylbenzylamine, N-benzylpiperid-4-one, 1-phenyl-NN-dimethylcyclohexylamine, triphenylmethylamine, N-methyltriphenylmethylamine, benzophenone phenylhydrazone, and benzo[h]quinoline. Various substitution and displacement reactions of some similar derivatives have also been examined.
96 citations
95 citations
TL;DR: Palladium(O) carbonyl complexes, Pd(CO)(PPh 3 ) 3 Pd 3 (CO) 3 (Pph 3 ) 2 PdCl 2 with carbon monoxide at room temperature in methanol/amine systems involving primary and secondary amines such as diethylamine and cyclohexylamine, are interconvertible under suitable conditions as mentioned in this paper.
94 citations
TL;DR: In this paper, it has been shown that no metallic palladium is present after the nucleation procedure of nonconducting substrates with stannous chloride and palladium chloride solutions, and the results indicate that a tin-palladium complex, containing one palladium atom per two tin atoms is formed and that this initiates the nickel-phosphorus deposition from a suitable electroless plating solution.
Abstract: It has been generally accepted that metallic palladium nuclei are formed by the nucleation procedure of nonconducting substrates with stannous chloride and palladium chloride solutions. However, results of experiments on glass using radioactive tracers and ellipsometry have shown that no metallic palladium is present after the nucleation procedure. The results indicate that presumably a tin‐palladium complex, containing one palladium atom per two tin atoms is formed and that this initiates the nickel‐phosphorus deposition from a suitable electroless plating solution.
TL;DR: In this paper, the authors examined the performance of supported ruthenium catalysts for reducing NO to N2 in an exhaust-like feedstream and found that the rate and temperature of NO removal is largely dependent on the NO inlet concentration and independent of the concentration of reducing agents in the system.
TL;DR: In this paper, the behavior of a trickle bed in which the catalytic packing was incompletely wetted was investigated using the selective hydrogenation of crotonaldehyde to n -butyraldehyde as a model reaction.
01 Jun 1973
TL;DR: In this paper, the lattice constants of isostructural series show a trend which also is known for the radii of the actinide elements, and the preparation of alloy phases of some other transition and main group elements, e.g., Zr, Hf, Nb, Ta, MgBa, are reported.
TL;DR: In this article, superconducting transition temperatures up to 16 K have been observed for Pd-Ag alloys charged with deuterium or hydrogen by ion implantation at liquid helium temperatures.
TL;DR: In this article, the authors examined constant trends within the series of binary transition metal dioxygen complexes and suggested that the O-O and M-O values increase with increasing coordination number, and thus with an increase in partial positive charge on the metal.
Abstract: The cocondensation reactions of nickel, palladium, and platinum atoms with gaseous oxygen or dilute oxygen–argon mixtures at 4.2–10 °K give rise to binary transition metal dioxygen complexes. Variable concentration and diffusion controlled warm up studies, 16O/18O isotopic substitution studies, normal coordinate and isotope intensity calculations establish the complexes to be of the types M(O2) and (O2)M(O2). Both the mono- and bisdioxygen complexes contain the dioxygen molecules coordinated to the metal atom in a side-on fashion, with a unique D2d "spiro"-type structure favored for the bis-complexes. Frequency and bond stretching force constant trends within the series of complexes are examined and suggest that the O—O and M—O values increase with increasing coordination number, and thus with an increase in partial positive charge on the metal. This trend in O—O stretching frequencies is not in accord with the evaluation of metal–dioxygen bond strengths as based on the degree of reversibility of dioxygen...
TL;DR: In this article, a heterogeneous catalyst system was developed for the vapor-phase oxidation of ethylene to acetaldehyde, which consists of palladium-doped vanadium pentoxide and, usually, a third component such as Ti, Ru, Pt, or Ir.
TL;DR: In this article, the broad applicability of methylene insertion reaction as a method for identifying mono-and di-methyl-substituted eight-, ten-, and twelve-membered rings is demonstrated.
Abstract: This report is concerned not only with the syntheses of new ring systems and the preparation of derivatives of known rings but also with new types of catalysts based upon, e. g., nickel, iron, molybdenum, manganese, and palladium. The broad applicability of the methylene insertion reaction as a method for identifying mono- and di-methyl-substituted eight-, ten-, and twelve-membered rings is also demonstrated. A further section is concerned with the possible mechanism of CC bond formation in transition metal complexes; several earlier suggestions have been revised in the light of new experimental data. In addition, experimental results are discussed which indicate that the reactivity and selectivity of the complexes formed by the nickel-ligand catalyst and olefins or alkynes depend upon the structure of the ligands.
TL;DR: In this article, an intramolecular two stage dehydrogenation process is proposed for coupling of diphenyl ether and diphenylene oxide with coupling dimers, and yields and isomer distributions are attributed to reaction variables such as temperature, additives, and the nature of the substituent on a benzene ring.
Abstract: The oxidative coupling reaction of aromatic compounds proceeds catalytically with palladium salt under oxygen pressure. Yields and isomer distributions are attributed to the reaction variables such as temperature, additives, and the nature of the substituent on a benzene ring. Naphthalene was converted mainly into 1-substituted products and o-xylene into 4-substituted products. The coupling of diphenyl ether afforded diphenylene oxide with coupling dimers. An intramolecular two stage dehydrogenation process is proposed.
TL;DR: In this article, the synthesis of 1-octene, cyclohexene, styrene, acrylonitrile, vinyl acetate, ethyl acrylate and ethyl but-3-enoate with Pd(PAr 3 ) 2 (OAc) 2 was carried out in acetic acid at 50°.
TL;DR: In this paper, the authors showed that the active surface in chemisorption is confined to a few atomic layers, consistent with the known immiscibility of the component metals.