NDLI: Selective lanthanide-catalysed reactions. Catalytic properties of Sm and Yb metal vapour deposition products

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Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 6

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 5

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 4

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 3

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 2

Journal of the Chemical Society, Faraday Transactions 1 Vol -79

Journal of the Chemical Society, Faraday Transactions 1 Vol -69

Selective lanthanide-catalysed reactions. Catalytic properties of Sm and Yb metal vapour deposition products

Content Provider	Royal Society of Chemistry (RSC)
Author	Tsuchiya, Susumu Imamura, Hayao Kitajima, Keiji
Copyright Year	1989
Abstract	The characteristics of lanthanide catalysts obtained when Sm and Yb were vaporized into a frozen organic (tetrahydrofuran, benzene and methyl-cyclohexane) matrix (77 K) were investigated. These low-valent, highly dispersed lanthanide particles (indicated as Sm/THF, Sm/benzene, Yb/THF, Yb/benzene etc.) were catalytically active and selective for hydrogenation and isomerization. Samarium usually showed a greater activity than ytterbium. Olefin [ethene, propene, but-1-ene and (z)-but-2-ene] hydrogenation obeyed the rate law v=kPH, suggesting that the reaction is controlled by catalytic activation of hydrogen. The molecular isotopic identity of hydrogen was conserved during the hydrogenation. Yb/THF and Yb/benzene were active for partial hydrogenation of benzene to cyclohexene. For the hydrogenation of olefins and acetylenes the substrate specificity was high; thus C—C double bonds were more readily reduced than triple bonds. The samarium and ytterbium catalysts discriminate between terminal and internal C—C triple bonds, only internal CC bonds (but-2-yne and pent-2-yne) being reduced very selectively in contrast to acetylene, methylacetylene and but-1-yne. Solid base character of the lanthanide provides a cause for these differences in catalytic properties.
Starting Page	1647
Ending Page	1654
Page Count	8
File Format	PDF
ISSN	03009599
Volume Number	85
Issue Number	7
Journal	Journal of the Chemical Society, Faraday Transactions 1
DOI	10.1039/F19898501647
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Lanthanide Mitochondrial matrix Hydrogen Isomerization Propyne Ethylene Cyclohexene Hydrogenation Acetylene Propene Benzene Ytterbium Solid Base Rate equation Tetrahydrofuran Samarium
Content Type	Text
Resource Type	Article
Subject	Chemistry

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