Showing papers on "Palladium published in 1982"
Book•
01 Jan 1982
TL;DR: In this paper, the authors present a survey of complexes of the Group 5 Elements, including Chromium, Molybdenum, Tungsten and Technetium.
Abstract: Introduction and Survey.- Complexes of the Group 5 Elements.- Chromium Compounds.- Molybdenum Compounds.- Tungsten Compounds.- X3M=MX3 Compounds of Molybdenum and Tungsten.- Technetium Compounds.- Rhenium Compounds.- Ruthenium Compounds.- Osmium Compounds.- Iron, Cobalt and Iridium Compounds.- Rhodium Compounds.- Chiral Dirhodium (II) Catalysts and Their Applications.- Nickel, Palladium and Platinum Compounds.- Extended Metal Atom Chains.- Physical, Spectroscopic and Theoretical Results.
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TL;DR: In this article, the palladium-catalyzed reaction of aryl bromides with dialkyl phosphite in the presence of triethylamine is described.
Abstract: Dialkyl arylphosphonates are prepared by the palladium-catalyzed reaction of aryl bromides with dialkyl phosphite in the presence of triethylamine The similar treatment of vinyl bromides gives dialkyl vinylphosphonates stereoselectively
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TL;DR: In this article, the authors studied the hydrogenation of carbon monoxide using a mixture of three different silicas and three different zeolites and found that the selectivity and the activity of the catalysts are strongly dependent on the nature of the support and on the state of the metal on its surface.
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TL;DR: In this paper, the interaction of carbon monoxide with small palladium particles supported on UHV-cleaved and heat-treated single-crystal mica was studied.
TL;DR: Palladium catalyzed decarboxylative allylation of active methylene compounds was performed under mild neutral conditions using allylic carbonates, which are much more reactive than allylic acetates or phenoxides used commonly in the reaction as discussed by the authors.
TL;DR: In this article, the double carbonylation catalyst Tertiary phosphine-coordinated palladium compounds are used as the double-carbonylation catalyzer for α-keto amides.
TL;DR: The lattice parameters of the fcc phases coexisting in the palladiumsolute-hydrogen (solute Ag, Au, Cu, Ni, Fe, Y, Ce and V) and nickel-solute -hydrogen systems prepared by electrolytic charging with hydrogen were measured at room temperature as a function of solute concentration using X-ray diffraction.
Abstract: The lattice parameters of the fcc phases coexisting in the palladiumsolute-hydrogen (solute Ag, Au, Cu, Ni, Fe, Y, Ce and V) and nickel-solute-hydrogen (solute Cu, Fe, Al and Si) systems prepared by electrolytic charging with hydrogen were measured at room temperature as a function of solute concentration using X-ray diffraction
TL;DR: In this paper, the reaction of NUC-allylpalladium complexes with carbon nucleophiles is a well-established reaction both stoichiometric and catalytic reactions are possible.
Abstract: Various transformations of allylic esters and ethers via ir—allylic complexes catalyzed by palladium—phosphine complexes have been studied Intramolecular reaction of a nucleophile offers a good synthetic method for five—membered ring ketones Also nucleophiles reacted easily with ct—acetoxy—,y—unsaturated nitriles and 1,3—diene monoepoxides It was found that the Carroll rearrangement is catalyzed by palladium complexes under mild conditions Facile formation of conjugated dienes and terminal olefins from allylic esters and ethers has been studied INTRODUCTION Palladium complexes catalyze numerous reactions (Refl) One important and unique group of reactions catalyzed by palladium complexes is the transformation of various allylic compounds Especially allylic ethers and esters undergo various reactions smoothly in the presence of palladium—phosphine complexes as a catalyst In the reaction of these allylic compounds, the first step is the oxidative addition of allylic compounds to Pd° species to form ir—allylpalladium complexes, which then undergo several transformations In this paper, several transformations of various allylic compounds catalyzed by palladium complexes discovered in our laboratory are presented REACTIONS OF NUCLEOPHILES The reaction of ¶-allylpalladium complexes with nucleophiles is a wellestablished reaction Both stoichiometric and catalytic reactions are possible (Ref2) Especially the reaction with carbon nucleophiles offers a good method for carbon—carbon bond formation We have studied further synthetic applications of reactions of allylic compounds via ir-allylpalladium complexes We have carried out studies aimed at preparing fiveand six-membered cyclic ketones by the palladium—catalyzed intramolecular reaction of active methylene with allyl phenyl ether moiety We have synthesized methyl (E)-3-oxo-8phenoxy-6-octenoate (1) by the reaction of the dianion of methyl acetoacetate with (E)-l-chloro-4-pfienoxy-2-butene (77% yield), and carried out its cyclization using 5-10 mol% of Pd(OAc)2-piosphine or phosphite as a catalyst in various solvents without using a base (Ref3) 0 CO2Me OPh 1 2Me eCO2Me + Pd(OAc)2 PPh3 2 —Pd(OAc)2 P T'°JCO2Me
TL;DR: In this paper, a decarbonylation of the aroyl chloride was proposed to give arylated alkenes, specifically cinnamic acid derivatives and stilbenes.
TL;DR: In this article, the metal particle size distributions have been determined both by small angle X-ray scattering (SAXS) and wide angle Xray scattering(WAXS), and the degree of dispersion was dependent on the nature of the support.
Patent•
30 Sep 1982TL;DR: In this article, a method and apparatus for carrying out partial oxidation of hydrocarbon feeds to produce hydrogen rich gases suitable for steam reforming, utilizes a monolithic platinum and palladium containing catalyst, and the process comprises introducing an oxygen containing oxidant gas (e.g., air), steam and a hydrocarbon feed into a catalytic partial oxidation apparatus comprising an adiabatic reaction vessel.
Abstract: A method and apparatus for carrying out partial oxidation of hydrocarbon feeds to produce hydrogen rich gases suitable for steam reforming, utilizes a monolithic platinum and palladium containing catalyst. The process comprises introducing an oxygen containing oxidant gas (e.g., air), steam and a hydrocarbon feed into a catalytic partial oxidation apparatus comprising an adiabatic reaction vessel. The oxidation catalyst preferably comprises platinum, palladium and optionally rhodium distended upon a stabilized alumina washcoat. At least one half by weight of the hydrocarbon feed is catalytically oxidized in the monolith at a high throughput rate to produce an effluent suitable for further processing, such as steam reforming.
TL;DR: In this paper, a method for the synthesis of 9-organo-substituted o -carboranes and m-carborane by substitution of iodine was proposed.
TL;DR: In this paper, a hydrogen sensitive detection technique utilizing a surface acoustic wave (SAW) delay line coated with a palladium thin film is presented, which produces a change in the velocity of SAW propagating on the coated substrate, which is detected as phase shift at the output of the delay line.
Abstract: A hydrogen sensitive detection technique utilizing a surface acoustic wave (SAW) delay line coated with a palladium thin film is presented. The hydrogen‐palladium interaction produces a change in the velocity of SAW propagating on the coated substrate, which is detected as phase shift at the output of the delay line. Presently, hydrogen concentrations as small as 50 ppm in a flowing H2+N2 mixture have been detected.
TL;DR: In this article, the sequential amination-amination and alkylation-amination of (Z)-4-acetoxybut-2-enyl diethyl phosphate (1b) with high regio-and stereoselectivity was demonstrated.
TL;DR: In this paper, it is suggested that the surface species is formed on palladium and after that is strongly adsorbed on alumina due to the spillover phenomenon, and an attempt is made to explain the difference between the reaction pathways of methanation and methanol formation.
TL;DR: Aryl, hetero-aryl, and vinylic halides react with carbon monoxide (40 atm pressure or less) and a secondary amine at 60-100°C in the presence of a catalytic amount of palladium compound to form α-ketoamides, in addition to simple amides as by-products as discussed by the authors.
TL;DR: In this paper, a metal-polyyne polymers consisting of conjugated acetylenic systems, where PD and R represent the Pd(PBu3)2-moiety and alkyl groups, respectively, were prepared by polycondensation between palladium chlorides and α,ω-diethynyl compounds in amines using a catalytic amount of cuprous iodide.
Abstract: Metal-polyyne polymers consisting of palladium and conjugated acetylenic systems,
where PD and R represent the —Pd(PBu3)2—moiety and alkyl groups, respectively, were prepared by polycondensation between palladium chlorides and α,ω-diethynyl compounds in amines using a catalytic amount of cuprous iodide. The molecular weights of the polymers formed were greatly affected by the basicity of the amines and the addition of free phosphines to the polymerization system. Under the optimum conditions, i.e., in the presence of CuI and PBu3 (in molar ratio 1/4) in piperidine at room temperature, polymer Ia (R1 = R2 = H) having Mw = 29,000 was obtained.
TL;DR: In this article, the reactions of perfluoroalkyl iodides with allyl, vinyl or aryl halides with ultrasonically dispersed zinc in the presence of palladium catalyst are described.
Abstract: The reactions of perfluoroalkyl iodides with allyl, vinyl or aryl halides with ultrasonically dispersed zinc in the presence of palladium catalyst proceeded smoothly to give the corresponding allyl...
TL;DR: In this article, the authors used tributyl tin hydride with Pd(PO 3 ) 4 to achieve high chemoselective conjugate reduction of α,β-unsaturated carbonyl compounds.