Showing papers on "Palladium published in 1980"
456 citations
TL;DR: The discovery in 1972 by two research groups that dihalodiphosphinenickel(II) complexes exhibit extremely high catalytic activity for selective cross-coupling of Grignard reagents with sp2-carbon halides has aroused wide-spread interest in application in organic synthesis of this type and related reactions involving other organometallics than Grignards and not only nickel but also palladium complexes as catalysts as mentioned in this paper.
Abstract: The discovery in 1972 by two research groups that dihalodiphosphinenickel(II) complexes exhibit extremely high catalytic activity for selective cross-coupling of Grignard reagents with sp2-carbon halides has aroused wide-spread interest in application in organic synthesis of this type and related reactions involving other organometallics than Grignard reagents and not only nickel but also palladium complexes as catalysts. In this lecture several aspects of the title subject will be described centering argument on the Grignard coupling using a variety of phosphine-nickel and -palladium complexes of the formula MC12L2 (M = Ni or Pd; L2 = diphosphine) as catalyst precursors.
384 citations
TL;DR: In the presence of tetrakis(triphenylphosphine) palladium, phenyl and methyl or methoxyphenyl iodides and bromides were found to react with thiolate anions in alcoholic solven...
Abstract: In the presence of a catalytic amount of tetrakis(triphenylphosphine) palladium, phenyl and methyl or methoxyphenyl iodides and bromides were found to react with thiolate anions in alcoholic solven...
369 citations
299 citations
243 citations
191 citations
TL;DR: In this article, various allylic esters of acetoacetic acid undergo rearrangement to give γ, δ-unsaturated methyl ketones in high yields with elimination of carbon dioxide under mild conditions in the presence of catalytic amounts of Pd(OAc) 2 and PPh 3.
187 citations
TL;DR: In this article, the Schottky barrier formed at the interface between palladium film and n-type titanium oxide (TiO 2 ) single crystal is sensitive to hydrogen or other reducing gases in the ambient.
178 citations
Patent•
02 Dec 1980
TL;DR: A gas and electrolyte permeable metal layer is bonded to an ion-permeable membrane by electroless deposition to produce a metal deposit upon the membrane or diaphragm.
Abstract: A gas and electrolyte permeable metal layer is bonded to an ion-permeable membrane by electroless deposition to produce a permeable metal deposit upon the membrane or diaphragm. Advantageously, the membrane surface to be coated is pretreated with an amphoteric material. Thereafter, the treated surface is treated to deposit the coating. Typical metals deposited include platinum group metals, iron group metals, such as nickel, cobalt and others including gold and silver. The coatings are very thin, rarely in excess of about 50 to 100 microns. The coated membrane may be installed in an electrolytic cell used for producing chlorine and alkali by electrolysis of alkali metal chloride with the coating serving as one electrode and another opposed electrode on or adjacent to the opposite side of the membrane. It may also be used in water electrolysis and for other purposes. The coatings may be thickened by depositing other coatings of the same or different composition by suitable coating techniques. Especially adherent coatings are obtained when the metal deposited upon the pretreated surface is palladium metal or a mixture of palladium with another metal. Thickening coatings deposited upon such a porous palladium coating are found to have superior adherence and durability. The metal layer may be soaked or contacted with an alkali metal or an amalgam in the presence of water to modify its crystal structure or grain size, if desired.
174 citations
173 citations
TL;DR: In this paper, the Pd(II)-aoetate (I) reagieren mit tert.-Butylhydroperoxid (II) zu den tetrameren Titelkomplexen (III).
Abstract: Die Pd(II)-aoetate (I) reagieren mit tert.-Butylhydroperoxid (II) zu den tetrameren Titelkomplexen (III).
TL;DR: Optically active norbornyl and 1-phenylethyl alcohols and bromides were obtained, respectively, from either norbornene and styrene with trichlorosilane catalyzed by a chiral ferrocenylphosphine-palladium complex followed by treatment with potassium fluoride.
TL;DR: Enolstannanes serve as nucleophiles towards allylic acetates under the influence of palladium(O) catalyst as discussed by the authors, and can be used as catalysts.
TL;DR: In this paper, a single current pulse and a potentiostatic technique were applied to determine the diffusion coefficients of H in Pd over a wide range of concentration and at different temperatures.
Abstract: A palladium bielectrode has been used in a viscous electrolyte consisting of glycerin and phosphoric acid. The transport of molecular hydrogen from and to the electrode is remarkably diminished in this electrolyte in comparison with aqueous electrolytes. Therefore, changes of the electrode potential are unambiguously related to concentration changes caused by diffusion within the electrode. A single current pulse and a potentiostatic technique were applied to determine the diffusion coefficients of H in Pd over a wide range of concentration and at different temperatures. New evaluation methods for current‐time and potential‐time curves also yield values of the initial concentration, which are in excellent agreement with the values calculated from previous coulometric titrations. A special arrangement of two bielectrodes also allows the measurement of small differences in the diffusivities of hydrogen in the two electrodes. Results for hydrogen diffusion in pure palladium are in excellent agreement with Gorsky effect measurements.
TL;DR: A number of new cyclometallated compounds of palladium with 2-arylpyridines have been synthesized and characterized as discussed by the authors, and the effect of varying substituents on the aryl nucleus supports the concept that after initial N-complexation, the 2-position of the anisotropic nucleus undergoes electrophilic attack by the palladium atom.
Patent•
02 Jan 1980TL;DR: In this paper, a spinel spinel metal oxide is used as a catalyst for purifying exhaust gas composed of a catalyst carrier coated with a metal oxide material containing a spinels metal oxide of the formula: MAl 2 O 4 wherein M is Sr, Mg, Cu, Mn, Mo, Zn, Fe, Co or Ni.
Abstract: A catalyst for purifying exhaust gas composed of a catalyst carrier coated with a metal oxide material containing a spinel metal oxide of the formula: MAl 2 O 4 wherein M is Sr, Mg, Cu, Mn, Mo, Zn, Fe, Co or Ni the metal oxide coated carrier further being coated with rhodium and platinum and/or palladium as catalytically active components The catalytically active components also can include cerium
TL;DR: In this article, the crystal structure of (η3-cyclooctatrienyl)2Ni has been determined by X-ray methods; the two nickel-bonded η3allyl groups are mutually trans.
TL;DR: In this paper, allyl-allyl couplings between allylstannanes and allyl acetates catalyzed by palladium(O) were shown to be possible in the presence of a distannane and a palladium catalyst.
TL;DR: A series of 1 : 1 adducts have been prepared by treating the bis-η3-allyl complexes of nickel, palladium and platinum with tertiary phosphines as discussed by the authors.
TL;DR: The one-step carboxylation of aromatic compounds such as benzene, toluene, anisole, chlorobenzene, furan, and thiophen has been carried out using carbon monoxide and palladium acetate; the reaction does not require oxygen and is electrophilic.
Abstract: The one-step carboxylation of aromatic compounds such as benzene, toluene, anisole, chlorobenzene, furan, and thiophen has been carried out using carbon monoxide and palladium acetate; the reaction does not require oxygen and is electrophilic.
TL;DR: In this paper, the reactions of allylic or benzylic bromides with 1-alkenyldisiamylboranes readily available from 1alkynes in the presence of sodium hydroxide and catalytic amounts of tetrakis-(triphenylphosphine)palladium to give corresponding 1,4-alkadienes or allylbenzenes in good yields