29124-49-0Relevant academic research and scientific papers
C-H Bond Activations by Monoanionic, PNP-Supported Scandium Dialkyl Complexes
Levine, Daniel S.,Tilley, T. Don,Andersen, Richard A.
, p. 4647 - 4655 (2015/10/28)
A series of scandium dialkyl complexes, (PNP)ScR2 (R = neopentyl, trimethylsilylmethyl), supported by the monoanionic, chelating PNP ligand (2,5-bis(dialkylphosphinomethyl)pyrrolide; alkyl = cyclohexyl, tert-butyl) was synthesized, and the reactivities of these complexes toward simple hydrocarbons was investigated. The scandium-carbon bonds undergo σ-bond metathesis reactions with hydrogen, and these complexes are catalysts for the hydrogenation of alkenes. Reactions with primary amines led to formation of amido complexes that undergo cyclometalation via σ-bond metathesis, without involvement of an imido complex intermediate. A variety of carbon-hydrogen bonds are also activated, including sp-, sp2-, and sp3-C-H bonds (intramolecularly in the latter case).
Exchange Reactions of Alkanes containing Quaternary Carbon Atoms over Supported Metal Catalysts
Brown, Ronald,Kemball, Charles
, p. 2159 - 2172 (2007/10/02)
A comparison has been made of the exchange reactions with deuterium of 2,2-dimethylpropane (DMP), 2,2,3,3-tetramethylbutane (TMB) and 2,2,4,4-tetramethylpentane (TMP) over supported catalysts containing iridium, palladium, platinum or rhodium at temperatures in the neighbourhood of 400 K.Reactions were followed mass-spectrometrically and products were also examined by deuterium n.m.r. spectroscopy.Four processes or mechanisms were found to contribute to different extents with the various hydrocarbon-metal systems.These were (I) stepwise exchange, (II) methyl-group exchange, and more general multiple exchange involving (III) αγ-diadsorbed or (IV) αδ-diadsorbed intermediates.Some isomerisation of TMP was observed to occur simultaneously with exchange with the TMP-rhodium system.
