ChemInform Abstract: One‐Pot Synthesis of Carbazoles by Palladium‐Catalyzed N‐Arylation and Oxidative Coupling.
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Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.Cite
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Chemical vapor deposition (CVD) of palladium is at present not used commercially, despite the widespread use of palladium films in electronics and data storage, because suitable precursors are not available. New palladium precursors, ally (β‐diketonato)palladium(II) complexes (see Figure) are reported, along with the conditions required for the formation of pure palladium films by CVD. magnified image
Deposition
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The reactions of palladium atoms with olefins have been studied by low-temperature i.r. spectroscopy and the most stable compounds observed, bis(cyclo-octa-1,5-diene)palladium and tris(bicyclo[2.2.1]heptene)-palladium have been prepared from palladium atoms on a gram scale.
Heptene
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The complexing agent 4\|(2\|pyridylazo) resorcinol (PAR) and its color reaction with palladium were studied. Palladium reacted with PAR to form a brown\|green complex in sulfuric acid. The maximum absorption of complex was at 595nm, and apparent molar absorption coefficient was 8.24×103 L/mol.cm. Beer's law was obeyed for palladium in the range of 5 to 100 μg/10 ml. The interferences of various ions were also studied. The method was used for the determination of palladium\|nickel and palladium\|cobalt plating bath with satisfactory results.
Resorcinol
Plating (geology)
Molar absorptivity
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In modern organic chemistry, palladium-catalyzed reactions, e.g. cross couplings, are broadly used as a powerful synthetic method. These processes mostly proceed through a palladium(0)/palladium(II) redox couple, which rests upon the smooth interconversion between palladium(0) and palladium(II) species. Recently, catalytic reactions involving a palladium(IV) intermediate that is generated in situ by the oxidation of a palladium(II) precursor have attracted exceptional interest in organic synthesis. Such palladium(II)/palladium(IV) catalysis can realize unprecedented transformations complementary to the conventional palladium(0)/palladium(II) catalysis because of the unique reactivity of high-valent palladium(IV) complexes. In this review article, we focus on the difunctionalization of alkenes and alkynes based on the palladium(II)/palladium(IV) catalytic cycle.
Catalytic cycle
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Article Comparisons of the Absorption of Hydrogen by Palladium/Platinum, Palladium/Nickel and Palladium/Rhodium Series of Alloys was published on March 1, 1973 in the journal Zeitschrift für Physikalische Chemie (volume 84, issue 1-4).
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Palladium is a very useful chemical modifier for graphite furnace atomic absorption spectrometry. It can be used to stabilise many elements several hundred degrees higher than is possible with current methods. Its performance as a modifier is strongly affected by the sample matrix. The addition of a reducing agent provides for more consistent performance. The main purpose of the reducing agent is to "modify" the form of the palladium, guaranteeing that palladium is reduced to the metal early in the temperature programme. Differences were seen in the behaviour of the palladium modifier depending on the reduction method used. A comparison of palladium modifier methods in spike recovery studies of thallium was carried out to investigate differences between the reduction methods. It was suspected that differences in the physical form of palladium contributed to the variability in results. Scanning electron micrographs were used to investigate the physical form of palladium on the graphite surface. A method using the palladium modifier for the determination of selenium was compared with a commonly used procedure in spike recovery studies.
Matrix (chemical analysis)
Reducing agent
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