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- W2037223682 abstract "The coupling reaction of 4-methylpyridine to form 4,4′-dimethyl-2,2′-bipyridine using a carbon-supported palladium catalyst was studied. Whereas previous research indicated that the reaction is catalyzed by palladium(0), we have found evidence that the reaction is catalyzed by palladium(II). Although oxygen can be used as the oxidative agent, the reaction is ultimately limited by catalyst deactivation. The major source of deactivation is most likely depletion of the palladium(II) oxide. The catalyst is reduced during the reaction and in the case of the oxygen-treated catalyst a small amount of palladium appears to be dissolved. In an investigation of the catalyst using X-ray photoelectron spectroscopy (XPS) and solid state nuclear magnetic resonance (NMR) it was found that deactivation is also caused by poisoning, the poison being either the product and/or the by-product." @default.
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- W2037223682 date "2000-12-01" @default.
- W2037223682 modified "2023-10-02" @default.
- W2037223682 title "Investigation of the palladium catalyzed aromatic coupling of pyridine derivatives" @default.
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- W2037223682 doi "https://doi.org/10.1016/s1381-1169(00)00365-4" @default.
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